build: autoconf 2.71 warns that %.raw.h was already defined #25501
Description
The master branch (cc22bd7) on Ubuntu 22.04:
$ ./autogen.sh
...
src/Makefile.bench.include:97: warning: %.raw.h was already defined in condition TRUE, which includes condition ENABLE_BENCH ...
src/Makefile.am:1065: 'src/Makefile.bench.include' included from here
src/Makefile.test.include:420: ... '%.raw.h' previously defined here
src/Makefile.am:1062: 'src/Makefile.test.include' included from here
...