Test

Drop `EMPTY_SWITCH_DEFAULT_CASE()` exclusion from `build/Makefile.gcov` #1421

Job	Run time
Generate Matrix	9s
Suite / LINUX_X32_DEBUG_ZTS	12m 26s
Suite / MACOS_ARM64_DEBUG_NTS	16m 39s
Suite / WINDOWS_X64_ZTS	32m 49s
Suite / LINUX_X64_ASAN_DEBUG_ZTS	44m 46s
Suite / ALPINE_X64_ASAN_DEBUG_ZTS	31m 52s
Suite / LINUX_X64_RELEASE_NTS	27m 28s
Suite / BENCHMARKING	15m 6s
Suite / FREEBSD_NTS	12m 3s
Suite / COVERAGE	0s
Suite / LIBMYSQLCLIENT	0s
Suite / COMMUNITY_${{ matrix.type }}	0s
Suite / SOLARIS	0s
Suite / MSAN	0s
Suite / LINUX_PPC64_ASAN_DEBUG_ZTS	0s
Suite / PECL	0s
Suite / OPCACHE_VARIATION	0s
	3h 13m 18s

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