updated build info for Opensuse

Building-for-Linux.md

@@ -33,10 +33,12 @@ You'll need to download and install the following to build Citra:
     - Deb: `apt-get install build-essential`
     - Arch: `pacman -S base-devel`
     - Fedora: `dnf install gcc-c++`
+    - OpenSUSE: `zypper in gcc-c++`
   * [Clang](https://github.com/llvm-mirror/clang) 5.0+ 
     - Deb: `apt-get install clang clang-format libc++-dev` (in some distros, clang-5.0).
     - Arch: `pacman -S clang`, `libc++` is in the AUR. Use pacaur or yaourt to install it.
     - Fedora: `dnf install clang libcxx-devel`
+    - OpenSUSE: `zypper in clang`
 * [CMake](http://www.cmake.org/) 3.8+
   - Deb: `apt-get install cmake`
   - Arch: `pacman -S cmake`