monero: fix armv6* build

srcpkgs/monero/template

@@ -1,7 +1,7 @@
 # Template file for 'monero'
 pkgname=monero
 version=0.11.1.0
-revision=1
+revision=2
 conf_files="/etc/monerod.conf"
 build_style=cmake
 hostmakedepends="pkg-config"
@@ -27,6 +27,7 @@ case "$XBPS_TARGET_MACHINE" in
 	armv7*) configure_args+=" -DARCH=armv7"
 	;;
 	armv6*) configure_args+=" -DARCH=armv6"
+		makedepends+=" libatomic-devel"
 	;;
 	aarch64*) configure_args+=" -DARCH=aarch64"
 	;;
@@ -34,6 +35,14 @@ case "$XBPS_TARGET_MACHINE" in
 	;;
 esac
 
+pre_configure() {
+	case "$XBPS_TARGET_MACHINE" in
+	armv6*) sed -i CMakeLists.txt \
+  		-e '/include(version.cmake)/i list(APPEND EXTRA_LIBRARIES libatomic.a)'
+		;;
+	esac
+}
+
 post_install() {
 	vlicense LICENSE
 	vbin build/bin/monero-blockchain-import