Add profile to enable gnu11 for gcc44 on el6

profiles/el6-gcc44_gnu11-x86_64-shared

+[settings]
+arch=x86_64
+build_type=RelWithDebInfo
+compiler=gcc
+compiler.cppstd=gnu11
+compiler.libcxx=libstdc++
+compiler.version=4.4
+os=Linux
+
+[options]
+*:shared=True