scripts: Fix meson-install-symlink.py overwriting existing links

By default, symlink re-creation fails if the link already exists, more
specifically in case of meson-install-symlink.py:

Traceback (most recent call last):
  File "/<path_to_libvirt_repo>/scripts/meson-install-symlink.py",
    line 15, in <module>
        os.symlink(target, link)
FileExistsError: File exists: '../default.xml' -> 'default.xml'

Unfortunately, Python can't mimic "ln -sf", so we have to fix this
differently - remove the existing link first and then try re-creating
it.

Signed-off-by: Erik Skultety <[email protected]>
Reviewed-by: Pavel Hrdina <[email protected]>

Author: eskultety

scripts/meson-install-symlink.py

@@ -12,4 +12,8 @@
 
 os.makedirs(workdir, exist_ok=True)
 os.chdir(workdir)
+
+if os.path.exists(link):
+    os.remove(link)
+
 os.symlink(target, link)