expat: Drop unneeded libtool patch, we use cmake

This patch is old. We use cmake for building expat now and libtool isn't even
used. The upstream author asked questions about it and can clearly be dropped
so do so.

(From OE-Core rev: 2988a10ac4767ef8db21715124dda6f294448d2a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/expat/expat/libtool-tag.patch

@@ -1,30 +0,0 @@
-From 10342e6b600858b091bc7771e454d9e06af06410 Mon Sep 17 00:00:00 2001
-From: Khem Raj <raj.khem@gmail.com>
-Date: Thu, 2 Nov 2017 18:20:57 +0800
-Subject: [PATCH] Add CC tag to build
-
-Add CC tag to build
-
-Upstream-Status: Pending
-Signed-off-by: Khem Raj <raj.khem@gmail.com>
-Signed-off-by: Dengke Du <dengke.du@windriver.com>
----
- Makefile.in | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/Makefile.in b/Makefile.in
-index 9560a95..d444bd6 100644
---- a/Makefile.in
-+++ b/Makefile.in
-@@ -319,7 +319,7 @@ LIBCURRENT = @LIBCURRENT@
- LIBOBJS = @LIBOBJS@
- LIBREVISION = @LIBREVISION@
- LIBS = @LIBS@
--LIBTOOL = @LIBTOOL@
-+LIBTOOL = @LIBTOOL@ --tag CC
- LIPO = @LIPO@
- LN_S = @LN_S@
- LTLIBOBJS = @LTLIBOBJS@
--- 
-2.7.4
-

meta/recipes-core/expat/expat_2.4.3.bb

@@ -9,7 +9,6 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=9e2ce3b3c4c0f2670883a23bbd7c37a9"
 VERSION_TAG = "${@d.getVar('PV').replace('.', '_')}"
 
 SRC_URI = "https://github.com/libexpat/libexpat/releases/download/R_${VERSION_TAG}/expat-${PV}.tar.bz2  \
-           file://libtool-tag.patch \
            file://run-ptest \
            "