gpsbabel: use qmake build-helper

enable cross-builds and fix package cleanup

srcpkgs/gpsbabel/template

@@ -4,6 +4,7 @@ version=1.5.4
 revision=1
 wrksrc="gpsbabel-gpsbabel_${version//./_}"
 build_style=gnu-configure
+build_helper=qmake
 makedepends="qt5-devel libusb-compat-devel"
 depends="desktop-file-utils"
 short_desc="Converts waypoints, tracks, and routes between popular GPS formats"
@@ -14,10 +15,10 @@ distfiles="https://github.com/gpsbabel/${pkgname}/archive/${pkgname}_${version//
 checksum=8cd740db0b92610abff71e942e8a987df58cd6ca5f25cca86e15f2b00e190704
 
 replaces="gpsbabel-gui>=0"
-nocross="Builds components as the host arch"
 
 if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" qt5-devel"
+	configure_args+=" ac_cv_prog_QMAKE=${XBPS_WRAPPERDIR}/qmake"
 fi
 
 do_build() {
@@ -44,7 +45,7 @@ do_install() {
 	mv gui/*.qm ${DESTDIR}/usr/share/gpsbabel/translations
 }
 
-do_clean() {
+post_pkg() {
 	# Remove temporary stuff from masterdir
 	rm -rf ${XBPS_BUILDDIR}/babelweb
 }