cmake: test is a reserved keyword

cmake/FindCcache.cmake

@@ -50,7 +50,7 @@ option (CCACHE "")
 file(WRITE "${CMAKE_SOURCE_DIR}/test.cpp" "int main() { return 0; }")
 set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE}")
 set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK    "${CCACHE}")
-add_executable(test test.cpp)
+add_executable(main test.cpp)
 ]=])
 	try_compile(RET "${TEST_PROJECT}/build" "${TEST_PROJECT}" "test" CMAKE_FLAGS -DCCACHE="${CCACHE_FOUND}")
 	unset(TEST_PROJECT)