Revert "hardening: Disable GCC randstruct for COMPILE_TEST"

This reverts commit f5c68a4.

It is again possible to build "allmodconfig" with the randstruct GCC
plugin, so enable it for COMPILE_TEST to catch future bugs.

Signed-off-by: Kees Cook <[email protected]>

Author: kees

security/Kconfig.hardening

@@ -344,7 +344,7 @@ config CC_HAS_RANDSTRUCT
 
 choice
 	prompt "Randomize layout of sensitive kernel structures"
-	default RANDSTRUCT_FULL if COMPILE_TEST && CC_HAS_RANDSTRUCT
+	default RANDSTRUCT_FULL if COMPILE_TEST && (GCC_PLUGINS || CC_HAS_RANDSTRUCT)
 	default RANDSTRUCT_NONE
 	help
 	  If you enable this, the layouts of structures that are entirely