Makefile.am: dist missing libtool patch

The patches were not added to the list of patches to be supplied with a
make dist so were missing in the final archive.

Makefile.am

@@ -69,6 +69,8 @@ EXTRA_DIST += \
 	extras/tools/libtool-2.4.7-bitcode.patch \
 	extras/tools/libtool-2.4.7-clang-libs.patch \
 	extras/tools/libtool-2.4.7-response-files.patch \
+	extras/tools/libtool-2.4.7-lpthread.patch \
+	extras/tools/libtool-2.4.7-embed-bitcode.patch \
 	extras/tools/ragel-6.8-javacodegen.patch
 
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