libgfortran build failure on AIX

[David Edelsohn]

	I am seeing a new failure while build libgfortran:

xgcc: @CFLAGS@: No such file or directory
make[3]: *** [fmain.lo] Error 1

I think libgfortran/configure.ac is missing

Index: configure.ac
===================================================================
--- configure.ac        (revision 126296)
+++ configure.ac        (working copy)
@@ -121,6 +121,7 @@
 fi
 AC_SUBST(AM_FCFLAGS)
 AC_SUBST(AM_CFLAGS)
+AC_SUBST(CFLAGS)

 # Check for symbol versioning (copied from libssp).
 AC_MSG_CHECKING([whether symbol versioning is supported])


David