qtractor: update to 0.9.21.

Closes: #29509 [via git-merge-pr]

srcpkgs/qtractor/template

@@ -1,11 +1,13 @@
 # Template file for 'qtractor'
 pkgname=qtractor
-version=0.9.14
+version=0.9.21
 revision=1
 wrksrc="qtractor-qtractor_${version//./_}"
 build_style=gnu-configure
-configure_args="--enable-debug"
-hostmakedepends="automake pkg-config"
+build_helper=qmake
+configure_args="--enable-debug ac_cv_qmake=${XBPS_WRAPPERDIR}/qmake
+ ac_cv_libsuil_gtk2_in_qt5=yes ac_cv_libsuil_x11_in_qt5=yes"
+hostmakedepends="automake pkg-config qt5-qmake qt5-host-tools"
 makedepends="dssi-devel jack-devel ladspa-sdk liblo-devel libmad-devel
  libsamplerate-devel lilv-devel qt5-tools-devel qt5-x11extras-devel
  rubberband-devel sratom-devel suil-devel vamp-plugin-sdk-devel"
@@ -16,10 +18,7 @@ license="GPL-2.0-or-later"
 homepage="http://qtractor.org"
 changelog="https://raw.githubusercontent.com/rncbc/qtractor/master/ChangeLog"
 distfiles="https://github.com/rncbc/qtractor/archive/qtractor_${version//./_}.tar.gz"
-checksum=16795d130ab4e79e76cd535251ff3d5f827731c628b9aee658c2c48e6f326e4d
-
-# configure fails to find qt5 headers
-nocross="https://build.voidlinux.org/builders/armv7l-musl_builder/builds/3458/steps/shell_3/logs/stdio"
+checksum=3e8c89d6d6a7a8d84280b5254020515640ef61b8ec356d8aaa3e0da118738daa
 
 pre_configure() {
 	autoreconf -if