[babl] Added PKGBUILD for archlinux, based on AUR.

[Øyvind Kolås <ok src gnome org>]

commit 3845d48f8e32868d307c57390863baea1ba7520b
Author: Félix Piédallu <felix piedallu me>
Date:   Thu Dec 14 15:12:25 2017 +0100

    Added PKGBUILD for archlinux, based on AUR.

 build/archlinux/PKGBUILD |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)
---
diff --git a/build/archlinux/PKGBUILD b/build/archlinux/PKGBUILD
new file mode 100644
index 0000000..2d5fc76
--- /dev/null
+++ b/build/archlinux/PKGBUILD
@@ -0,0 +1,42 @@
+# Maintainer: Alexander Hunziker <alex hunziker gmail com>
+# Contributor: Alessio Biancalana <dottorblaster gmail com>
+# Contributor: Massimiliano Torromeo <massimiliano torromeo gmail com>
+# Contributor: Salamandar <felix piedallu me>
+
+pkgname=babl-meson-git
+_pkgname=babl
+pkgver=0.1.38.14.g9677c79
+pkgrel=1
+pkgdesc="babl is a dynamic, any to any, pixel format translation library."
+arch=('i686' 'x86_64')
+url="https://www.gegl.org/babl";
+license=('LGPL3')
+depends=('glibc')
+makedepends=('meson')
+provides=("babl=${pkgver}")
+conflicts=('babl')
+options=(!libtool)
+source=(git+https://github.com/salamandar/babl#branch=meson)
+md5sums=('SKIP')
+
+_gitname=babl
+
+build() {
+    mkdir "${srcdir}/build" -p
+
+    meson "${srcdir}/${_gitname}"\
+          "${srcdir}/build" \
+        --prefix=/usr \
+        -Dwith-docs=false
+
+    ninja -C "${srcdir}/build"
+}
+
+package() {
+    DESTDIR="${pkgdir}" ninja -C "${srcdir}/build" install
+}
+
+pkgver() {
+    cd "${srcdir}/${_gitname}"
+    git describe --always | sed -e 's/BABL_//g' -e 's/[_-]/./g'
+}