main/libx11: security upgrade to 1.6.6

CVE-2018-14598
CVE-2018-14599
CVE-2018-14600

fixes #9533

main/libx11/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=libx11
-pkgver=1.6.5
-pkgrel=2
+pkgver=1.6.6
+pkgrel=0
 pkgdesc="X11 client-side library"
 url="http://xorg.freedesktop.org/"
 arch="all"
@@ -13,6 +13,13 @@ makedepends="$depends_dev xorgproto util-macros xmlto"
 source="https://www.x.org/releases/individual/lib/libX11-$pkgver.tar.bz2"
 
 builddir="$srcdir"/libX11-$pkgver
+
+# secfixes:
+#   1.6.6-r0:
+#   - CVE-2018-14598
+#   - CVE-2018-14599
+#   - CVE-2018-14600
+
 build() {
 	cd "$builddir"
 	./configure \
@@ -37,4 +44,4 @@ package() {
 	install -Dm644 COPYING "$pkgdir"/usr/share/licenses/$pkgname/COPYING
 }
 
-sha512sums="63c40d37c92b8d1ac78541830b0c624c4e936924b26bce769936e0e2523fa8997be364647705057065f803f804897ea8173d1c41ef69a92832f20cc7c0fd40a0  libX11-1.6.5.tar.bz2"
+sha512sums="9866dc6b158b15a96efe140b6fa68a775889a37e5565a126216211fee63868e02629a9f9f41816d590ef150560f43b8864010a77a6318c9109e76aec1d21b4d7  libX11-1.6.6.tar.bz2"