src/utilities: fix build without pthread

[ffontaine]

• Remove is_default_thread function which is an internal and not used
  function
• Remove g_main_thread_id as it was used only by is_default_thread

Fixes:

• http://autobuild.buildroot.net/results/5320bbe1205e782e3516d9bead8d1ed825bcbaad

Signed-off-by: Fabrice Fontaine fontaine.fabrice@gmail.com

[sergiud]

Your PR fails to build.

[ffontaine]

PR is now ok on Travis. Remaining errors are not related with this PR:

/usr/src/app/src/logging_unittest.cc:43:10: fatal error: sys/wait.h: No such file or directory
 #include <sys/wait.h>

[sergiud]

Please rebase and let the CI run again.

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[ffontaine]

I'm not sufficiently familiar with rebasing :-/ I think I screw it :-/ I can always create a brand new PR if needed.

[googlebot]

CLAs look good, thanks!

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