From e7cf4adb92206f49c42dc2de3ae900de16449107 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 26 Sep 2021 13:13:16 -0400
Subject: m4/ax_compiler_vendor.m4: New file

Now needed for AX_CFLAGS_WARN_ALL().

Fixes:

    configure.ac:55: warning: AX_COMPILER_VENDOR is m4_require'd but not m4_defun'd
    m4/ax_cflags_warn_all.m4:84: AX_FLAGS_WARN_ALL is expanded from...
    m4/ax_cflags_warn_all.m4:142: AX_CFLAGS_WARN_ALL is expanded from...
    configure.ac:55: the top level

And:

    ./configure: line 3786: AX_COMPILER_VENDOR: command not found
    checking CFLAGS for most reasonable warnings... configure: WARNING: Unknown compiler vendor returned by AX_COMPILER_VENDOR
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