buildsys: Do not error on GNUHASH for clean targets

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Rules.mak

@@ -601,7 +601,7 @@ ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
 # Be sure that binutils support it
 LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
 ifeq ($(LDFLAGS_GNUHASH),)
-ifneq ($(filter-out install_headers headers-y,$(MAKECMDGOALS)),)
+ifneq ($(filter-out $(clean_targets) install_headers headers-y,$(MAKECMDGOALS)),)
 $(error Your binutils do not support --hash-style option, while you want to use it)
 endif
 else