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Add preprocessor macro for default death test style.

Google Test has recently (02/09/2018) switched the default death test
style from "fast" to "threadsafe" in
https://github.com/google/googletest/commit/ec7faa943d7817c81ce7bdf71a21ebc9244dc8de

Threadsafe death tests have been used internally for a while, and are
proven to be a better default.

However, adopting this better default can be challenging for large
projects with a significant investment in custom infrastructure built on
top of Google Test. The same custom infrastructure can make it difficult
for large projects to switch back to the old default by passing in
--gtest_death_test_style=fast.

For the reasons above, the default switch is considered too disruptive,
and this CL reverts it. This CL also introduces the
GTEST_DEFAULT_DEATH_TEST_STYLE preprocesor macro, which replaces the
hard-coded default. The macro can be defined in
gtest/internal/custom/gtest-port.h by projects that are ready to migrate
to thread-safe death tests.

CMAKE_DEBUG_POSTFIX is a global configuration parameter, and
changing it pollutes the configuration space for other projects
that enclose this project.

DEBUG_POSTFIX is better to use since it is a target-specific poperty.

Fixes #1334
Fixes #1268

Removed trailing comma in enum

merge check - 3

merging unittests - 2

merging unittests - 2

merging unitests

merging unitests

TEST() arguments are invalid in an example

Fix unused function warning on Mac OS.

Both names must be valid C++ identifiers, and they should not contain underscore (`_`)

merges

As of recently, Google Test fails to compile with the warning below when
used in projects with strict warning settings.

googletest/src/gtest-death-test.cc:1004:13: error: unused function 'StackGrowsDown' [-Werror,-Wunused-function]

Fix std::iscntrl use in gtest-printers.cc

cleanup, merges

cleanup, merges

merging, cleaning up

merges

merges