regex: use limits-h SSIZE_MAX

ChangeLog

@@ -3,9 +3,11 @@
 	limits-h: other modules can rely on SSIZE_MAX
 	* lib/areadlink-with-size.c, lib/areadlinkat-with-size.c:
 	* lib/careadlinkat.c, lib/getdelim.c, lib/getndelim2.c:
+	* lib/regex_internal.h:
 	(SSIZE_MAX): Do not define.
 	* modules/areadlink-with-size, modules/areadlinkat-with-size:
 	* modules/careadlinkat, modules/getdelim, modules/getndelim2:
+	* modules/regex:
 	(Depends-on) Add limits-h.
 
 	limits-h: define SSIZE_MAX

lib/regex_internal.h

@@ -151,9 +151,6 @@
    as some non-GCC platforms lack them, an issue when this code is
    used in Gnulib.  */
 
-#ifndef SSIZE_MAX
-# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
-#endif
 #ifndef ULONG_WIDTH
 # define ULONG_WIDTH REGEX_UINTEGER_WIDTH (ULONG_MAX)
 /* The number of usable bits in an unsigned integer type with maximum

modules/regex

@@ -28,6 +28,7 @@ intprops                [test $ac_use_included_regex = yes]
 iswctype                [test $ac_use_included_regex = yes]
 langinfo                [test $ac_use_included_regex = yes]
 libc-config             [test $ac_use_included_regex = yes]
+limits-h                [test $ac_use_included_regex = yes]
 lock                    [test $ac_use_included_regex = yes]
 memcmp                  [test $ac_use_included_regex = yes]
 memmove                 [test $ac_use_included_regex = yes]