musl: fix powerpc soft-float

package/musl/Makefile

@@ -37,8 +37,12 @@ ifeq ($(ADK_TARGET_CPU_ARCH),i486)
 MARCH:=			i386
 endif
 ifeq ($(ADK_TARGET_CPU_ARCH),ppc)
+ifeq ($(ADK_TARGET_SOFT_FLOAT),y)
+MARCH:=			powerpc-sf
+else
 MARCH:=			powerpc
 endif
+endif
 ifeq ($(ADK_TARGET_CPU_ARCH),ppc64)
 MARCH:=			powerpc64
 endif