Put all glslang internals (but not the external interface) into the glslang namespace.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22882 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/preprocessor/PpMemory.cpp

@@ -91,6 +91,8 @@ NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #undef malloc
 #undef free
 
+namespace glslang {
+
 struct chunk {
     struct chunk        *next;
 };
@@ -184,3 +186,5 @@ int TPpContext::mem_AddCleanup(MemoryPool *pool, void (*fn)(void *, void*), void
     pool->cleanup = cleanup;
     return 0;
 }
+
+} // end namespace glslang