package/gcc: remove leftover from legacy PowerPC patch

In commit 0c82f3f63563 (package/gcc: remove powerpc conditional patching
logic), the macro defining the conditional patch was removed, but it was
still referenced and expanded in the apply-patches hook.

Drop that now.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gcc/gcc.mk

@@ -44,7 +44,6 @@ define HOST_GCC_APPLY_PATCHES
 			$(APPLY_PATCHES) $(@D) $${patchdir} \*.patch || exit 1; \
 		fi; \
 	done
-	$(HOST_GCC_APPLY_POWERPC_PATCH)
 endef
 
 HOST_GCC_EXCLUDES = \