Include <strings.h> globally

Various code uses str{,n}casecmp() so include <strings.h>, if it
exists, everywhere.

* configure.ac: Check for <strings.h> explicitly.
* src/makeint.h: Include it if HAVE_STRINGS_H, for str{,n}casecmp().
* src/job.c: Remove include of <strings.h>.
* src/main.c: Ditto.

1 files changed, 0 insertions, 3 deletions

diff --git a/src/job.c b/src/job.c
index 35fbda00..a42c426c 100644
--- a/src/job.c
+++ b/src/job.c
@@ -30,9 +30,6 @@ this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Default shell to use.  */
 #ifdef WINDOWS32
-# ifdef HAVE_STRINGS_H
-#  include <strings.h>  /* for strcasecmp, strncasecmp */
-# endif
 # include <windows.h>
 
 const char *default_shell = "sh.exe";