testing/gtk-server: put config in /etc

testing/gtk-server/APKBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Miles Alan <m@milesalan.com>
 pkgname=gtk-server
 pkgver=2.4.6
-pkgrel=0
+pkgrel=1
 pkgdesc="Interpreted GUI Programming for GTK"
 url="https://www.gtk-server.org/"
 # x86: textrels
@@ -24,6 +24,7 @@ build() {
 	CFLAGS="$CFLAGS -flto=auto" \
 	./configure \
 		--prefix=/usr \
+		--sysconfdir=/etc \
 		--host=$CHOST \
 		--build=$CBUILD \
 		--with-gtk3