py/makeqstrdefs.py: Process only CPP line-numbering info.

Not stuff like "#pragma", etc.
diff --git a/py/makeqstrdefs.py b/py/makeqstrdefs.py
index 35d7658..0240505 100644
--- a/py/makeqstrdefs.py
+++ b/py/makeqstrdefs.py
@@ -31,7 +31,7 @@
     last_fname = None
     outf = None
     for line in f:
-        if line and line[0] == "#":
+        if line and line[0:2] == "# ":
             comp = line.split()
             fname = comp[2]
             assert fname[0] == '"' and fname[-1] == '"'