ARROW-4599: [C++] Add support for system GFlags#3675

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kou wants to merge 6 commits intoapache:masterfrom

kou:cpp-system-gflags

Commits on Feb 19, 2019

[C++] Add support for system GFlags

kou
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wesm
committed
GFLAGS_STATIC isn't defined by CONFIG mode

kou
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wesm
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Remove build directory entirely before new configuration build

kou
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wesm
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Don't use vendored GFlags when GFLAGS_HOME is specified

kou
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wesm
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Define GFLAGS_IS_A_DLL by target

kou
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wesm
committed
Fix rebase artifact
wesm
committed