linux4.14-headers: include objtool in the package (#9314)

It is now required to build out-of-tree modules with dkms, without it,
some modules that worked fine with earlier kernel versions can no longer
be compiled.

srcpkgs/linux4.14/template

@@ -1,7 +1,7 @@
 # Template file for 'linux4.14'
 pkgname=linux4.14
 version=4.14.0
-revision=1
+revision=2
 patch_args="-Np1"
 wrksrc="linux-${version%.*}"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
@@ -235,6 +235,10 @@ do_install() {
 	mkdir -p ${hdrdest}/mm
 	cp fs/xfs/libxfs/xfs_sb.h ${hdrdest}/fs/xfs/libxfs/xfs_sb.h
 
+	# Add objtool binary, needed to build external modules with dkms
+	mkdir -p ${hdrdest}/tools/objtool
+	cp tools/objtool/objtool ${hdrdest}/tools/objtool
+
 	# Copy in Kconfig files
 	for i in $(find . -name "Kconfig*"); do
 		mkdir -p ${hdrdest}/$(echo $i | sed 's|/Kconfig.*||')