re PR libgcj/31228 (Race condition between setting close-on-exec and Runtime.exec())

re PR libgcj/31228 (Race condition between setting close-on-exec and Runtime.exec())

	PR libgcj/31228
	* configure.ac: Add checks for getrlimit and sys/resource.h.
	* include/posix.h (_Jv_platform_close_on_exec): Remove.
	* include/config.h.in: Regenerate.
	* configure: Regenerate.
	* gnu/java/nio/channels/natFileChannelPosix.cc (open): Remove call to
	_Jv_platform_close_on_exec;
	* gnu/java/net/natPlainSocketImplPosix.cc (create): Likewise.
	(accept): Likewise.
	* gnu/java/net/natPlainDatagramSocketImplPosix.cc (create):Likewise.
	* java/lang/natPosixProcess.cc: Include sys/resource.h.
	(nativeSpawn): Close all file descriptors.  Don't set FD_CLOEXEC on
	pipes.

From-SVN: r123138