On Linux, #undef Status: we use that name for nested LLProcess struct.

Apparently something in the Linux system header chain #defines a macro Status
as 'int'. That's just Bad in C++ land. It should at the very least be a
typedef! #undefining it in llprocess.h permits the viewer to build.

indra/llcommon/llprocess.h

@@ -37,6 +37,10 @@
 #if LL_WINDOWS
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>                // HANDLE (eye roll)
+#elif LL_LINUX
+#if defined(Status)
+#undef Status
+#endif
 #endif
 
 class LLProcess;