install zrythm_launch on mac

data/meson.build

@@ -49,7 +49,7 @@ zrythm_launcher_config.set (
   'PROGRAM_NAME_LOWERCASE', prog_name_lowercase)
 
 # install desktop file and launcher scripts
-if os_gnu or os_freebsd
+if os_gnu or os_freebsd or os_darwin
   zrythm_launcher = configure_file (
     input: 'zrythm_launch.in',
     output: prog_name_lowercase + '_launch',
@@ -57,7 +57,9 @@ if os_gnu or os_freebsd
     install: true,
     install_dir: bindir,
     install_mode: 'r-xr-xr-x')
+endif
 
+if os_gnu or os_freebsd
   zrythm_gdb = configure_file (
     input: 'zrythm_gdb.in',
     output: prog_name_lowercase + '_gdb',