fixup musl-gcc patch, reported upstream

target/ppc/target.mk

@@ -2,4 +2,4 @@ include $(TOPDIR)/mk/kernel-ver.mk
 ARCH:=			powerpc
 CPU_ARCH:=		ppc
 TARGET_OPTIMIZATION:=	-Os -pipe
-TARGET_CFLAGS_ARCH:=	$(ADK_TARGET_CFLAGS)
+TARGET_CFLAGS_ARCH:=	$(ADK_TARGET_CFLAGS) -Wl,--secure-plt

toolchain/gcc/Makefile

@@ -62,7 +62,7 @@ GCC_CONFOPTS+=		--enable-tls
 endif
 
 ifeq ($(ARCH),powerpc)
-GCC_CONFOPTS+=		--disable-target-optspace
+GCC_CONFOPTS+=		--disable-target-optspace --with-long-double-64 --enable-secureplt
 else
 GCC_CONFOPTS+=		--enable-target-optspace
 endif