SLADE: use cmake-wxWidgets-gtk3 build_helper

srcpkgs/SLADE/template

@@ -3,6 +3,7 @@ pkgname=SLADE
 version=3.1.12a
 revision=3
 build_style=cmake
+build_helper=cmake-wxWidgets-gtk3
 hostmakedepends="pkg-config p7zip which"
 makedepends="SFML-devel fluidsynth-devel freeimage-devel ftgl-devel glew-devel
  gtk+3-devel libcurl-devel wxWidgets-gtk3-devel"
@@ -14,10 +15,6 @@ changelog="https://github.com/sirjuddington/SLADE/releases/tag/${version}"
 distfiles="https://github.com/sirjuddington/SLADE/archive/${version}.tar.gz"
 checksum=7dc8a0089855f6321d2ec185fa5c97fcb7cc54857033aa3adec9a5ec8226ed60
 
-if [ -z "$CROSS_BUILD" ]; then
-	configure_args+=" -DwxWidgets_CONFIG_EXECUTABLE=/usr/bin/wx-config-gtk3"
-fi
-
 pre_configure() {
 	case $XBPS_TARGET_MACHINE in
 		x86_64* | i686*);;