Remove crypt.h

gb.crypt does not need crypt.h because it only uses crypt functions from
unistd.h. On non-linux systems there is no crypt.h which causes autoconf
to fail.

gb.crypt/configure.ac

@@ -9,7 +9,6 @@ AC_PROG_LIBTOOL
 
 GB_COMPONENT(
   crypt, CRYPT, gb.crypt, [src],
-  [GB_FIND(crypt.h, $prefix /usr/lib /usr, include)],
   [GB_FIND(libcrypt.$SHLIBEXT, $prefix /usr/local /usr, lib)],
   [-lcrypt])
  

gb.crypt/src/c_crypt.c

@@ -30,10 +30,6 @@
 
 #include "gb_common.h"
 
-#ifndef OS_BSD
-  #include <crypt.h>
-#endif
-
 #include "c_crypt.h"
 #include "main.h"