add easyconfig Mesa-11.2.1-intel-2016a.eb, modify easyconfig...

add easyconfig Mesa-11.2.1-intel-2016a.eb, modify easyconfig freetype-2.6.3-intel-2016a.eb, add easyconfig pkg-config-0.29.1-intel-2016a.eb, add easyconfig libdrm-2.4.68-intel-2016a.eb, add easyconfig libXfont-1.5.1-intel-2016a-freetype-2.6.3.eb