[REVERT ME] libvisual-plugins: Drop "--install" from ACLOCAL_AMFLAGS

.. and install alsa.m4 ourselves.

This reverts commit 9b420cc.

Author: hartwork

.github/workflows/linux_and_macos.yml

@@ -129,6 +129,9 @@ jobs:
             popd
           done
 
+          ls -l libvisual-plugins/m4/
+          ls -l libvisual-plugins/m4/alsa.m4  # i.e. fail CI unless created
+
       - name: '[LV] Run "./configure" (from Git)'
         run: |-
           cd libvisual

libvisual-plugins/Makefile.am

@@ -1,6 +1,6 @@
 ## Process this file with automake to generate a Makefile.in
 
-ACLOCAL_AMFLAGS = -I m4 --install
+ACLOCAL_AMFLAGS = -I m4
 
 SUBDIRS = plugins po
 

libvisual-plugins/autogen.sh

@@ -11,6 +11,7 @@ fi
 
 autoreconf --install --verbose --force || \
 autoreconf --install --verbose --force
+cp -v "$(aclocal --print-ac-dir)"/alsa.m4 m4/
 
 if [[ -z "${NOCONFIGURE:-}" ]]; then
     if [[ "$#" == 0 ]]; then