volk: rebuild for gcc dropping gcc4 compat

Closes: #975 [via git-merge-pr]

srcpkgs/volk/template

@@ -1,7 +1,7 @@
 # Template file for 'volk'
 pkgname=volk
 version=1.4
-revision=1
+revision=2
 build_style=cmake
 nocross="not complete for arm"
 short_desc="Vector-Optimized Library of Kernels"
@@ -13,12 +13,6 @@ homepage="http://libvolk.org/"
 distfiles="https://github.com/gnuradio/volk/archive/v${version}.tar.gz"
 checksum=32131ba17846850c07270bc5897dd2de7130ec02ca029875a36966335120e7bf
 
-pre_configure() {
-	if [ -z $CROSS_BUILD ]; then
-		sed -i 's/-D_GLIBCXX_USE_CXX11_ABI=1/-D_GLIBCXX_USE_CXX11_ABI=0/g' CMakeLists.txt
-	fi
-}
-
 volk-devel_package() {
 	short_desc+=" - development files"
 	depends="${sourcepkg}-${version}_${revision}"