* libc/argz/argz_replace.c: Include buf_findstr.h.

	* libc/argz/argz_replace.c: Include buf_findstr.h.
	* libc/argz/buf_findstr.c: Likewise.
	* libc/argz/envz_entry.c: Include buf_findstr.h.  Cast return
	value to (char *).
	* libc/argz/envz_get.c: Likewise.
	* libc/include/sys/unistd.h: Add getopt and getsubopt declarations.
	* libc/stdlib/Makefile.am (LIB_SOURCES): Add getsubopt.c.
	* libc/stdlib/getsubopt.3: New file.
	* libc/stdlib/getsubopt.c: New file.
	* libc/sys/linux/machine/i386/socketcall.h (__sockcall_base):
	Change esp to ebp.