This converts megadriver installation to use symlinks so that we do
not have to deal with skipping the strip stage for some files, as
a result simplifying our template greatly.

--- a/bin/install_megadrivers.py
+++ b/bin/install_megadrivers.py
@@ -56,7 +56,7 @@ def main():
         if os.path.lexists(abs_driver):
             os.unlink(abs_driver)
         print('installing {} to {}'.format(args.megadriver, abs_driver))
-        os.link(master, abs_driver)
+        os.symlink(os.path.basename(master), abs_driver)
 
         try:
             ret = os.getcwd()
@@ -71,8 +71,7 @@ def main():
         finally:
             os.chdir(ret)
 
-    # Remove meson-created master .so and symlinks
-    os.unlink(master)
+    # Remove meson-created symlinks
     name, ext = os.path.splitext(master)
     while ext != '.so':
         if os.path.lexists(name):