always use long double 64 for ppc

toolchain/gcc/Makefile

@@ -70,12 +70,8 @@ endif
 endif
 
 ifeq ($(ARCH),powerpc)
-ifeq ($(ADK_TARGET_LIBC),musl)
 GCC_CONFOPTS+=		--disable-target-optspace --with-long-double-64 --enable-secureplt
 else
-GCC_CONFOPTS+=		--disable-target-optspace --with-long-double-128 --enable-secureplt
-endif
-else
 GCC_CONFOPTS+=		--enable-target-optspace
 endif