Use gm4 instead of m4; this is probably just a work-around
for some cross-build issues on ARM. However, it also means
that we use the same GNU m4 as upstream developers presumably
also use for processing these files and avoids future surprises.

--- configure.orig	2020-06-23 06:37:52 UTC
+++ configure
@@ -32212,10 +32212,10 @@ _LT_EOF
  ;;
     "src/esdcompat":F) chmod +x src/esdcompat ;;
     "src/start-pulseaudio-x11":F) chmod +x src/start-pulseaudio-x11 ;;
-    "src/daemon.conf":F) m4 src/daemon.conf > src/daemon.conf.gen && mv src/daemon.conf.gen src/daemon.conf ;;
-    "src/default.pa":F) m4 src/default.pa > src/default.pa.gen && mv src/default.pa.gen src/default.pa ;;
-    "src/system.pa":F) m4 src/system.pa > src/system.pa.gen && mv src/system.pa.gen src/system.pa ;;
-    "PulseAudioConfig.cmake":F) m4 PulseAudioConfig.cmake > PulseAudioConfig.cmake.gen && mv PulseAudioConfig.cmake.gen PulseAudioConfig.cmake ;;
+    "src/daemon.conf":F) gm4 src/daemon.conf > src/daemon.conf.gen && mv src/daemon.conf.gen src/daemon.conf ;;
+    "src/default.pa":F) gm4 src/default.pa > src/default.pa.gen && mv src/default.pa.gen src/default.pa ;;
+    "src/system.pa":F) gm4 src/system.pa > src/system.pa.gen && mv src/system.pa.gen src/system.pa ;;
+    "PulseAudioConfig.cmake":F) gm4 PulseAudioConfig.cmake > PulseAudioConfig.cmake.gen && mv PulseAudioConfig.cmake.gen PulseAudioConfig.cmake ;;
 
   esac
 done # for ac_tag