Move inttypes.h and stdint.h to stdlib.

inttypes.h and stdint.h are in sysdeps/generic, but there are no other
versions of these headers anywhere in the source tree, so they aren’t
actually system-dependent.  Move them to the subdirectory that
installs them (stdlib).

Reviewed-by: Joseph Myers <joseph@codesourcery.com>

	* sysdeps/generic/inttypes.h, sysdeps/generic/stdint.h:
	Move to stdlib.
	* include/inttypes.h: Adjust to match.
	* include/stdint.h: New wrapper.

ChangeLog

@@ -1,3 +1,10 @@
+2019-03-13  Zack Weinberg  <zackw@panix.com>
+
+	* sysdeps/generic/inttypes.h, sysdeps/generic/stdint.h:
+	Move to stdlib.
+	* include/inttypes.h: Adjust to match.
+	* include/stdint.h: New wrapper.
+
 2019-03-13  Zack Weinberg  <zackw@panix.com>
 
 	* scripts/check-obsolete-constructs.py: New test script.

include/inttypes.h

@@ -1,5 +1,5 @@
 #ifndef _INTTYPES_H
-#include_next <inttypes.h>
+#include <stdlib/inttypes.h>
 #ifndef _ISOMAC
 libc_hidden_proto (strtoumax)
 #endif

include/stdint.h

@@ -0,0 +1 @@
+#include <stdlib/stdint.h>