* libF77/getenv_.c (G77_getenv_0): Avoid signed/unsigned warning.
	* libF77/system_.c (G77_system_0): Likewise.
	* libI77/open.c (f_open): Likewise.
	* libI77/rdfmt.c (rd_Z): Likewise.
	* libI77/uio.c (do_us, do_ud): Likewise.

From-SVN: r54166