(jm_AC_PREREQ_XSTRTOUMAX): Remove jm_AC_HEADER_INTTYPES_H, as it

is now subsumed by autoconf.  Add inttypes.h.

m4/xstrtoumax.m4

@@ -5,10 +5,9 @@
 AC_DEFUN(jm_AC_PREREQ_XSTRTOUMAX,
 [
   AC_REQUIRE([jm_AC_TYPE_UINTMAX_T])
-  AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
   AC_REQUIRE([jm_AC_TYPE_UNSIGNED_LONG_LONG])
   AC_CHECK_DECLS([strtoul, strtoull])
-  AC_CHECK_HEADERS(limits.h stdlib.h)
+  AC_CHECK_HEADERS(limits.h stdlib.h inttypes.h)
 
   AC_CACHE_CHECK([whether <inttypes.h> defines strtoumax as a macro],
     jm_cv_func_strtoumax_macro,