Keep Make.bat stored with CRLF

.gitattributes normalises everything to LF, which rewrote the whole file
the first time this branch touched it and turned a two-line merge into a
whole-file conflict. Make.bat has been stored with CRLF since long before
that rule, so it is marked -text to leave it that way.

.gitattributes

@@ -1,2 +1,6 @@
 # Auto detect text files and normalize end of lines to LF (\n)
 * text=auto eol=lf
+
+# Make.bat has always been stored with CRLF; the blanket eol=lf above would
+# silently rewrite the whole file the first time anything touches it.
+Make.bat -text