meson/megadriver: support various lib suffixes

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32333>
(cherry picked from commit ffd02b8ad8)

Conflicts:
	bin/install_megadrivers.py

meson.build

@@ -20,6 +20,11 @@ project(
 if host_machine.system() == 'darwin'
   add_languages('objc', native : false)
   add_project_arguments('-fobjc-arc', language : 'objc')
+  libname_suffix = 'dylib'
+elif host_machine.system() == 'windows'
+  libname_suffix = 'dll'
+else
+  libname_suffix = 'so'
 endif
 
 cc = meson.get_compiler('c')