* config/linuxlibc1.mt (MT_CFLAGS): Add -D_G_STDIO_USES_LIBIO
	-D_G_HAVE_WEAK_SYMBOL.
	* genops.c: Add the proper weak alias if _G_STDIO_USES_LIBIO
	and _G_HAVE_WEAK_SYMBOL are defined.
	* iofclose.c: Likewise.
	* iofeof.c: Likewise.
	* ioferror.c: Likewise.
	* iogetc.c: Likewise.
	* ioputc.c: Likewise.
	* iovsprintf.c: Likewise.
	* iovsscanf.c: Likewise.

From-SVN: r25590