library: provide for validating result type references

During development, we now have a means for validating
that a type referenced in application code matches the
actual type set by the library. The new feature can be
activated through either of the following two methods:

1) ./configure CFLAGS='-DXTRA_PROCPS_DEBUG' (all pgms)

2) an #include <proc/xtra-procps-debug.h> (single pgm)

[ in the future, one could add a formal configure.ac ]
[ provision. but for now a manual approach is safer. ]

Lastly, for any module which provides a sort function,
the handling for both 'noop' & 'extra' enumerators was
made consistent. Now, 'noop' is not sorted and 'extra'
will be sorted as that module's widest supported type.

Signed-off-by: Jim Warner <james.warner@comcast.net>

proc/procps.h

@@ -34,4 +34,8 @@
 #define ESC_STRETCH 1  // since we mangle to '?' this is 1 (would be 4 for octal escapes)
 int escape_str(char *__restrict dst, const char *__restrict src, int bufsize, int *maxcells);
 
+#ifdef XTRA_PROCPS_DEBUG
+#include <proc/xtra-procps-debug.h>
+#endif
+
 #endif