main/libxklavier: specify bindir

Fixes:
[1539546288,000,xklavier_config_xkb.c:xkl_config_get_keyboard/] 	Could not exec /usr/share/X11/xkb/xkbcomp: 2

main/libxklavier/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=libxklavier
 pkgver=5.4
-pkgrel=3
+pkgrel=4
 pkgdesc="High-level API for X Keyboard Extension"
 url="http://gswitchit.sourceforge.net"
 arch="all"
@@ -33,6 +33,7 @@ build() {
 		--host=$CHOST \
 		--prefix=/usr \
 		--with-xkb-base=/usr/share/X11/xkb \
+		--with-xkb-bin-base=/usr/bin \
 		--disable-static
 	make
 }