configure.ac: fix UMP support detection

alsa-project/alsa-utils pull request #240 was opened from bkuhls:

https://github.com/alsa-project/alsa-utils/commit/b399fb85a919636b7da34e8bcf... added usage of alsa/ump_msg.h without checking whether alsa-lib was compiled with rawmidi support: https://github.com/alsa-project/alsa-lib/blob/master/include/Makefile.am#L37

Fixes a build error when alsa-lib was compiled with --disable-rawmidi

aplaymidi.c:34:10: fatal error: alsa/ump_msg.h: No such file or directory 34 | #include <alsa/ump_msg.h>

Request URL : https://github.com/alsa-project/alsa-utils/pull/240 Patch URL : https://github.com/alsa-project/alsa-utils/pull/240.patch Repository URL: https://github.com/alsa-project/alsa-utils