[PR PATCH] projectM: fix GUI applications for cross.

[fosslinux <fosslinux@users.noreply.github.com>]

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There is a new pull request by fosslinux against master on the void-packages repository

https://github.com/fosslinux/void-packages projectM-cross-icons
https://github.com/void-linux/void-packages/pull/25502

projectM: fix GUI applications for cross.
The template had a note:
`TODO: find out why these files aren't generated for the cross build`,
regarding the desktop files and icons that weren't being installed.
This was actually because the GUI application's weren't being built
at all! The build system could not find QT. Force enabling these
applications and doing qt shenanigans, including `build_helper=qmake`,
fixes these issues.

A patch file from https://github.com/void-linux/void-packages/pull/25502.patch is attached

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From 98336609a7cab7b2c3df2836efe56cccc638debb Mon Sep 17 00:00:00 2001
From: fosslinux <fosslinux@aussies.space>
Date: Sun, 11 Oct 2020 11:45:45 +1100
Subject: [PATCH] projectM: fix GUI applications for cross.

The template had a note:
`TODO: find out why these files aren't generated for the cross build`,
regarding the desktop files and icons that weren't being installed.
This was actually because the GUI application's weren't being built
at all! The build system could not find QT. Force enabling these
applications and doing qt shenanigans, including `build_helper=qmake`,
fixes these issues.
---
 srcpkgs/projectM/template | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/srcpkgs/projectM/template b/srcpkgs/projectM/template
index d7e5c0fa547..6d9fc6a0a94 100644
--- a/srcpkgs/projectM/template
+++ b/srcpkgs/projectM/template
@@ -1,10 +1,13 @@
 # Template file for 'projectM'
 pkgname=projectM
 version=3.1.7
-revision=2
+revision=3
 build_style=gnu-configure
-configure_args="--datadir=/usr/libexec"
-hostmakedepends="pkg-config qt5-host-tools automake libtool which"
+build_helper=qmake
+configure_args="--datadir=/usr/libexec --enable-qt --enable-pulseaudio
+ --enable-jack --enable-sdl"
+hostmakedepends="pkg-config qt5-host-tools automake libtool which qt5-qmake
+ qt5-tools-devel"
 makedepends="pulseaudio-devel alsa-lib-devel glew-devel ftgl-devel libXext-devel
  SDL2-devel gtkglext-devel jack-devel qt5-tools-devel libvisual-devel glm
  MesaLib-devel glu-devel"
@@ -21,11 +24,9 @@ if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
 fi
 
 post_install() {
-	if [ ! "$CROSS_BUILD" ]; then
-		# fix location of desktop files
-		# TODO: find out why these files aren't generated for the cross build
-		mv $DESTDIR/usr/libexec/{applications,icons} $DESTDIR/usr/share
-	fi
+	# fix location of desktop files
+	vmkdir usr/share
+	mv $DESTDIR/usr/libexec/{applications,icons} $DESTDIR/usr/share
 }
 
 projectM-devel_package() {