Fix cross-compilation to ppc MacOSX

Yeah, just build all the unneeded stuff (the executables like the
msgfmt command and their support libraries) in this case too, for
now. (We obviously won't be able to run ppc exectuables when
cross-compiling from Intel Mac.)

gettext/makefile.mk

@@ -57,6 +57,10 @@ CONFIGURE_ACTION=./configure --prefix=$(SRC_ROOT)/$(PRJNAME)/$(MISC) $(eq,$(VERB
 CONFIGURE_FLAGS=--disable-dependeny-tracking --disable-acl --disable-curses --without-emacs --without-git --disable-java
 CONFIGURE_FLAGS+=CPPFLAGS="$(EXTRA_CDEFS)" CFLAGS="$(ARCH_FLAGS) $(EXTRA_CFLAGS)" CXXFLAGS="$(ARCH_FLAGS) $(EXTRA_CFLAGS)"
 
+.IF "$(CROSS_COMPILING)"!=""
+CONFIGURE_FLAGS+= --build=$(BUILD_PLATFORM) --host=$(HOST_PLATFORM)
+.ENDIF
+
 BUILD_ACTION=$(GNUMAKE)
 BUILD_DIR=$(CONFIGURE_DIR)