Revert "Wrap: Use git instead of patch by default"

This reverts commit 718c86a7d5.

We can't always use git to apply patches because they might actually
apply to a git submodule inside a git subproject, and git will not be
able to apply the patch in that case.

mesonbuild/wrap/wrap.py

@@ -809,17 +809,15 @@ class Resolver:
             if not path.exists():
                 raise WrapException(f'Diff file "{path}" does not exist')
             relpath = os.path.relpath(str(path), self.dirname)
-            if GIT:
-                # Git is more likely to be available on Windows and more likely
-                # to apply correctly assuming patches are often generated by git.
-                # See https://github.com/mesonbuild/meson/issues/12092.
-                # The `--work-tree` is necessary in case we're inside a
+            if PATCH:
+                # Always pass a POSIX path to patch, because on Windows it's MSYS
+                cmd = [PATCH, '-f', '-p1', '-i', str(Path(relpath).as_posix())]
+            elif GIT:
+                # If the `patch` command is not available, fall back to `git
+                # apply`. The `--work-tree` is necessary in case we're inside a
                 # Git repository: by default, Git will try to apply the patch to
                 # the repository root.
                 cmd = [GIT, '--work-tree', '.', 'apply', '-p1', relpath]
-            elif PATCH:
-                # Always pass a POSIX path to patch, because on Windows it's MSYS
-                cmd = [PATCH, '-f', '-p1', '-i', str(Path(relpath).as_posix())]
             else:
                 raise WrapException('Missing "patch" or "git" commands to apply diff files')