gcc-plugins: disable under COMPILE_TEST

Since adding the gcc plugin development headers is required for the
gcc plugin support, we should ease into this new kernel build dependency
more slowly. For now, disable the gcc plugins under COMPILE_TEST so that
all*config builds will skip it.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index b7827dc..7936e5e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -708,8 +708,8 @@
 	bool "Code coverage for fuzzing"
 	depends on ARCH_HAS_KCOV
 	select DEBUG_FS
-	select GCC_PLUGINS
-	select GCC_PLUGIN_SANCOV
+	select GCC_PLUGINS if !COMPILE_TEST
+	select GCC_PLUGIN_SANCOV if !COMPILE_TEST
 	help
 	  KCOV exposes kernel code coverage information in a form suitable
 	  for coverage-guided fuzzing (randomized testing).