[GWP-ASan] Removed unittests from Android build.

[hctim]

Summary

Longstanding issues in the Android test runner means that compiler-rt unit
tests don't work on Android due to libc++ link-time issues. Looks like the
exported libc++ from the Android NDK is x86-64, even though it's part of the
ARM[64] toolchain... See similar measures for ASan and sanitizer-common that
disable unit tests for Android.

Should fully fix the Android bots (@vlad.tsyrklevich).

compiler-rt/test/gwp_asan/CMakeLists.txt

 set(GWP_ASAN_LIT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 set(GWP_ASAN_LIT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
 set(GWP_ASAN_TESTSUITES)
 
 set(GWP_ASAN_UNITTEST_DEPS)
 set(GWP_ASAN_TEST_DEPS
   ${SANITIZER_COMMON_LIT_TEST_DEPS}
   gwp_asan)
 
-if (COMPILER_RT_INCLUDE_TESTS)
+# Longstanding issues in the Android test runner means that compiler-rt unit
+# tests don't work on Android due to libc++ link-time issues. Looks like the
+# exported libc++ from the Android NDK is x86-64, even though it's part of the
+# ARM[64] toolchain... See similar measures for ASan and sanitizer-common that
+# disable unit tests for Android.
+if (COMPILER_RT_INCLUDE_TESTS AND COMPILER_RT_HAS_GWP_ASAN AND NOT ANDROID)
   list(APPEND GWP_ASAN_TEST_DEPS GwpAsanUnitTests)
   configure_lit_site_cfg(
     ${CMAKE_CURRENT_SOURCE_DIR}/unit/lit.site.cfg.in
     ${CMAKE_CURRENT_BINARY_DIR}/unit/lit.site.cfg)
   add_lit_testsuite(check-gwp_asan-unit "Running GWP-ASan unit tests"
     ${CMAKE_CURRENT_BINARY_DIR}/unit
     DEPENDS ${GWP_ASAN_TEST_DEPS})
   set_target_properties(check-gwp_asan-unit PROPERTIES FOLDER