revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/t/t7519/fsmonitor-env

@@ -1,24 +0,0 @@
-#!/bin/sh
-#
-# An test hook script to integrate with git to test fsmonitor.
-#
-# The hook is passed a version (currently 1) and a time in nanoseconds
-# formatted as a string and outputs to stdout all files that have been
-# modified since the given time. Paths must be relative to the root of
-# the working tree and separated by a single NUL.
-#
-#echo "$0 $*" >&2
-
-if test "$#" -ne 2
-then
-	echo "$0: exactly 2 arguments expected" >&2
-	exit 2
-fi
-
-if test "$1" != 1
-then
-	echo "Unsupported core.fsmonitor hook version." >&2
-	exit 1
-fi
-
-printf '%s\n' $FSMONITOR_LIST