meson/megadriver: stop removing the "master" .so file

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29731>

bin/install_megadrivers.py

@@ -70,8 +70,7 @@ def main():
         finally:
             os.chdir(ret)
 
-    # Remove meson-created master .so and symlinks
-    os.unlink(master)
+    # Remove meson-created .so symlinks
     name, ext = os.path.splitext(master)
     while ext != '.so':
         if os.path.lexists(name):

src/gallium/targets/va/meson.build

@@ -82,7 +82,6 @@ else
       idep_mesautil,
     ],
     link_depends : va_link_depends,
-    # Will be deleted during installation, see install_megadrivers.py
     install : true,
     install_dir : va_drivers_path,
     name_suffix : 'so',

src/gallium/targets/vdpau/meson.build

@@ -45,7 +45,6 @@ libvdpau_gallium = shared_library(
   ],
   link_depends : vdpau_link_depends,
   soversion : '@0@.@1@.0'.format(VDPAU_MAJOR, VDPAU_MINOR),
-  # Will be deleted during installation, see install_megadrivers.py
   install : true,
   install_dir : vdpau_drivers_path,
   name_suffix : 'so',