[glib/issue-1520] Install m4 macros unconditionally

[Emmanuele Bassi <ebassi src gnome org>]

commit e8fde0b9e7d9c8f76b374f67188f0229c6b01e42
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Sep 10 12:44:59 2018 +0100

    Install m4 macros unconditionally
    
    Partial revert of commit a7a6449f4d63357bf3a66140e9fb3ccb18611c0b.
    
    Checking for the availability of m4 for installing m4 macro files
    creates an implicit dependency on m4 even if GLib does not need it; this
    prevents building GLib and then installing Autotools in order to build a
    project that depends on GLib.
    
    Closes #1520

 meson.build | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)
---
diff --git a/meson.build b/meson.build
index f164091aa..7c59300b7 100644
--- a/meson.build
+++ b/meson.build
@@ -1885,7 +1885,6 @@ endif
 
 # Determine which user environment-dependent files that we want to install
 have_bash = find_program('bash', required : false).found() # For completion scripts
-have_m4 = find_program('m4', required : false).found() # For m4 macros
 have_sh = find_program('sh', required : false).found() # For glib-gettextize
 
 # FIXME: How to detect Solaris? https://github.com/mesonbuild/meson/issues/1578
@@ -1997,11 +1996,9 @@ if have_sh
     configuration : gettextize_conf)
 endif
 
-if have_m4
-  # Install m4 macros that other projects use
-  install_data('m4macros/glib-2.0.m4', 'm4macros/glib-gettext.m4', 'm4macros/gsettings.m4',
-    install_dir : join_paths(get_option('datadir'), 'aclocal'))
-endif
+# Install m4 macros that other projects use
+install_data('m4macros/glib-2.0.m4', 'm4macros/glib-gettext.m4', 'm4macros/gsettings.m4',
+  install_dir : join_paths(get_option('datadir'), 'aclocal'))
 
 if host_system != 'windows'
   # Install Valgrind suppression file (except on Windows,