meson: fix megadriver symlinking

Which should be relative instead of absolute.

Fixes: f7f1b30f81
       ("meson: extend install_megadrivers script to handle symmlinking")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105567
Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-and-Tested-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit 6ac87c1769)

bin/install_megadrivers.py

@@ -58,7 +58,7 @@ def main():
             while ext != '.so':
                 if os.path.exists(name):
                     os.unlink(name)
-                os.symlink(driver, name)
+                os.symlink(each, name)
                 name, ext = os.path.splitext(name)
         finally:
             os.chdir(ret)