Make clang detection work on AWS Ubuntu14.

lib/spack/spack/compilers/clang.py

@@ -101,7 +101,7 @@ def default_version(cls, comp):
                 ver = match.group(1) + '-apple'
             else:
                 # Normal clang compiler versions are left as-is
-                match = re.search(r'^clang version ([^ )]+)', output)
+                match = re.search(r'clang version ([^ )]+)', output)
                 if match:
                     ver = match.group(1)