[NFC] cmake: do not suppress -Wsign-compare globally (#1810)

Only disable `-Wsign-compare` for tests that do not compile cleanly
with this warning enabled.  Re-enable the warning for the other tests,
so that it can catch any new occurrences.

Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>

test_conformance/extensions/cl_khr_command_buffer/CMakeLists.txt

@@ -17,6 +17,8 @@ set(${MODULE_NAME}_SOURCES
     command_buffer_finalize.cpp
 )
 
+set_gnulike_module_compile_flags("-Wno-sign-compare")
+
 include(../../CMakeCommon.txt)
 
 add_subdirectory( cl_khr_command_buffer_mutable_dispatch )

test_conformance/extensions/cl_khr_command_buffer/cl_khr_command_buffer_mutable_dispatch/CMakeLists.txt

@@ -12,4 +12,6 @@ set(${MODULE_NAME}_SOURCES
     ../basic_command_buffer.cpp
 )
 
+set_gnulike_module_compile_flags("-Wno-sign-compare")
+
 include(../../../CMakeCommon.txt)