Bump to mono/mono/2019-08@29b1ac19 (#3449)

[jonpryor]

Changes: http://github.com/mono/mono/compare/2c3aeaf3780de7392a0d3cbe4dcf86846eb4dffa...29b1ac19c961b959a09097dbc0fe4cd567cc5298

$ git diff --shortstat 2c3aeaf3..29b1ac19
 1528 files changed, 45421 insertions(+), 21967 deletions(-)

Changes: mono/api-doc-tools@d03e819...5da8127

$ git diff --shortstat d03e8198..5da8127a
 1001 files changed, 86168 insertions(+), 11863 deletions(-)

Changes: mono/api-snapshot@e09042d...1ca8e82

$ git diff --shortstat e09042da..1ca8e82f
    28 files changed, 612 insertions(+), 217 deletions(-)

Changes: dotnet/cecil@a6c8f5e...cb6c1ca

$ git diff --shortstat a6c8f5e1..cb6c1ca9
 13 files changed, 233 insertions(+), 88 deletions(-)

Changes: mono/corefx@4806207...470e0e1

$ git diff --shortstat 4806207f...470e0e10
 4 files changed, 31 insertions(+), 12 deletions(-)

Changes: dotnet/linker@ebe2a1f...1f87de3

$ git diff --shortstat ebe2a1f4...1f87de35
 90 files changed, 3219 insertions(+), 1224 deletions(-)

Changes: dotnet/java-interop@75b1189...4fd3539

$ git diff --shortstat 75b11891...4fd35393
 34 files changed, 448 insertions(+), 52 deletions(-)

Upstream-Fixes: https://bugs.winehq.org/show_bug.cgi?id=47561
Upstream-Fixes: https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems/edit/967582
Upstream-Fixes: https://github.com/dotnet/coreclr/issues/25071
Upstream-Fixes: https://github.com/dotnet/coreclr/issues/25242
Upstream-Fixes: https://github.com/dotnet/coreclr/issues/25632
Upstream-Fixes: https://github.com/dotnet/coreclr/issues/25709
Upstream-Fixes: https://github.com/dotnet/corefx/issues/37955
Upstream-Fixes: https://github.com/dotnet/corefx/issues/38455
Upstream-Fixes: mono/mono#7377
Upstream-Fixes: mono/mono#8747
Upstream-Fixes: mono/mono#9621
Upstream-Fixes: mono/mono#9664
Upstream-Fixes: mono/mono#9706
Upstream-Fixes: mono/mono#10201
Upstream-Fixes: mono/mono#10645
Upstream-Fixes: mono/mono#10748
Upstream-Fixes: mono/mono#10848
Upstream-Fixes: mono/mono#12141
Upstream-Fixes: mono/mono#13311
Upstream-Fixes: mono/mono#13408
Upstream-Fixes: mono/mono#13412
Upstream-Fixes: mono/mono#13891
Upstream-Fixes: mono/mono#13923
Upstream-Fixes: mono/mono#13945
Upstream-Fixes: mono/mono#14170
Upstream-Fixes: mono/mono#14214
Upstream-Fixes: mono/mono#14214
Upstream-Fixes: mono/mono#14215
Upstream-Fixes: mono/mono#14243
Upstream-Fixes: mono/mono#14377
Upstream-Fixes: mono/mono#14495
Upstream-Fixes: mono/mono#14555
Upstream-Fixes: mono/mono#14724
Upstream-Fixes: mono/mono#14729
Upstream-Fixes: mono/mono#14772
Upstream-Fixes: mono/mono#14792
Upstream-Fixes: mono/mono#14793
Upstream-Fixes: mono/mono#14809
Upstream-Fixes: mono/mono#14830
Upstream-Fixes: mono/mono#14839
Upstream-Fixes: mono/mono#14841
Upstream-Fixes: mono/mono#14847
Upstream-Fixes: mono/mono#14864
Upstream-Fixes: mono/mono#14871
Upstream-Fixes: mono/mono#14917
Upstream-Fixes: mono/mono#14945
Upstream-Fixes: mono/mono#14946
Upstream-Fixes: mono/mono#14948
Upstream-Fixes: mono/mono#14957
Upstream-Fixes: mono/mono#14959
Upstream-Fixes: mono/mono#14960
Upstream-Fixes: mono/mono#14961
Upstream-Fixes: mono/mono#14963
Upstream-Fixes: mono/mono#14971
Upstream-Fixes: mono/mono#14972
Upstream-Fixes: mono/mono#14975
Upstream-Fixes: mono/mono#15023
Upstream-Fixes: mono/mono#15048
Upstream-Fixes: mono/mono#15058
Upstream-Fixes: mono/mono#15080
Upstream-Fixes: mono/mono#15182
Upstream-Fixes: mono/mono#15188
Upstream-Fixes: mono/mono#15189
Upstream-Fixes: mono/mono#15261
Upstream-Fixes: mono/mono#15262
Upstream-Fixes: mono/mono#15263
Upstream-Fixes: mono/mono#15265
Upstream-Fixes: mono/mono#15268
Upstream-Fixes: mono/mono#15307
Upstream-Fixes: mono/mono#15324
Upstream-Fixes: mono/mono#15329
Upstream-Fixes: mono/mono#15330
Upstream-Fixes: mono/mono#15441
Upstream-Fixes: mono/mono#15446
Upstream-Fixes: mono/mono#15503
Upstream-Fixes: mono/mono#15541
Upstream-Fixes: mono/mono#15551
Upstream-Fixes: mono/mono#15556
Upstream-Fixes: mono/mono#15596
Upstream-Fixes: mono/mono#15691
Upstream-Fixes: mono/mono#15692
Upstream-Fixes: mono/mono#15740
Upstream-Fixes: mono/mono#15751
Upstream-Fixes: mono/mono#15760
Upstream-Fixes: mono/mono#15781
Upstream-Fixes: mono/mono#15794
Upstream-Fixes: mono/mono#15825
Upstream-Fixes: mono/mono#15853
Upstream-Fixes: mono/mono#15878
Upstream-Fixes: mono/mono#15887
Upstream-Fixes: mono/mono#15990
Upstream-Fixes: mono/mono#16032
Upstream-Fixes: mono/mono#16411
Upstream-Fixes: mono/mono#16486
Upstream-Fixes: https://github.com/mono/mono/issues/25709
Upstream-Fixes: https://github.com/mono/mono/issues/38821
Upstream-Fixes: #3112
Upstream-Fixes: #3168

Update build-tools/automation/build.groovy so that it fully cleans
the build tree before starting the build, so that the vestigial mono
submodule (removed in 0c9f83b) is actually removed from the build
tree, so that we don't inadvertently use ancient submodule contents.

[jonpryor]

/azp run

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