tools: m4: update to 1.4.21
authorJohn Audia <therealgraysky@proton.me>
Wed, 11 Feb 2026 22:56:42 +0000 (17:56 -0500)
committerRobert Marko <robimarko@gmail.com>
Fri, 13 Feb 2026 15:56:37 +0000 (16:56 +0100)
commitce9a0ff3fb88d037080aaf95af92ac5da4fcfdba
tree136955949f9470d91dbdf21bc7bd0d40aad5ace9
parent2c099e5623089522d843ccd334e15e6b58874c6e
tools: m4: update to 1.4.21

Changelog: https://github.com/autotools-mirror/m4/blob/branch-1.4/NEWS

This update fixes a build error on my system:
./string.h:777:20: error: expected identifier or '(' before '_Generic'
  777 | _GL_EXTERN_C void *memchr (const void *__s, int __c, size_t __n)
      |                    ^~~~~~

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/21987
Signed-off-by: Robert Marko <robimarko@gmail.com>
tools/m4/Makefile