* include/unistd.h: Use libc_hidden_proto for _exit, alarm, confstr,

* include/unistd.h: Use libc_hidden_proto for _exit, alarm, confstr,

	execl, execle, execlp, execvp, getpid, getsid.
	* sysdeps/generic/alarm.c: Add libc_hidden_def.
	* sysdeps/unix/alarm.c: Likewise.
	* posix/confstr.c: Likewise.
	* posix/execvp.c: Likewise.
	* posix/execlp.c: Likewise.
	* posix/execle.c: Likewise.
	* posix/execl.c: Likewise.
	* sysdeps/generic/getsid.c: Likewise.
	* sysdeps/mach/hurd/getsid.c: Likewise.
	* sysdeps/generic/getpid.c: Add libc_hidden_weak.
	* sysdeps/mach/hurd/getpid.c: Likewise.

	* include/stdlib.h: Use libc_hidden_proto for ecvt_r, fcvt_r,
	qecvt_r, qfcvt_r, lrand48_r.
	* misc/efgcvt_r.c: Add libc_hidden_def.

	* include/wordexp.h: Use libc_hidden_proto for wordfree.
	* sysdeps/generic/wordexp.c: Add libc_hidden_def.

	* include/langinfo.h: Use libc_hidden_proto for nl_langinfo.
	* locale/nl_langinfo.c: Add libc_hidden_def.

	* include/glob.h: Use libc_hidden_proto for glob, globfree, globfree64.
	* sysdeps/generic/glob.c: Add libc_hidden_def.
	* sysdeps/generic/glob64.c: Likewise.
	* sysdeps/wordsize-64/glob.c (globfree64): Add libc_hidden_weak.