Fix tx19 sanitization.

gdb/config/mips/.Sanitize

@@ -15,6 +15,20 @@
 
 Do-first:
 
+tx19_files="tm-tx19.h tm-tx19l.h tx19.mt tx19l.mt"
+
+if ( echo $* | grep keep\-tx19 > /dev/null ) ; then
+	keep_these_too="${tx19_files} ${keep_these_too}"
+	if [ -n "${verbose}" ] ; then
+		echo Keeping ${tx19_files}
+	fi
+else
+	lose_these_too="${tx19_files} ${lose_these_too}"
+	if [ -n "${verbose}" ] ; then
+		echo Deleting ${tx19_files}
+	fi
+fi
+
 # All files listed between the "Things-to-keep:" line and the
 # "Files-to-sed:" line will be kept.  All other files will be removed.
 # Directories listed in this section will have their own Sanitize
@@ -91,10 +105,6 @@ r3900.mt
 r3900l.mt
 tm-r3900.h
 tm-r3900l.h
-tm-tx19.h
-tm-tx19l.h
-tx19.mt
-tx19l.mt
 
 Do-last: