(USER_H): Add iso646.h back.

From-SVN: r29497

gcc/Makefile.in

@@ -147,7 +147,8 @@ INSTALL_HEADERS_DIR = @build_install_headers_dir@
 # to programs compiled with GCC.
 USER_H = $(srcdir)/ginclude/stdarg.h $(srcdir)/ginclude/stddef.h \
     $(srcdir)/ginclude/varargs.h $(srcdir)/ginclude/proto.h \
-    $(srcdir)/ginclude/stdbool.h $(EXTRA_HEADERS) $(LANG_EXTRA_HEADERS)
+    $(srcdir)/ginclude/stdbool.h $(srcdir)/ginclude/iso646.h \
+    $(EXTRA_HEADERS) $(LANG_EXTRA_HEADERS)
 
 # Target to use whe installing assert.h.  Some systems may
 # want to set this empty.
@@ -3191,4 +3192,3 @@ float.h-cross:
 	echo "#error float.h values not known for cross-compiler" >> t-float.h-cross
 	echo "#endif" >> t-float.h-cross
 	mv t-float.h-cross float.h-cross
-