Remove the /n flag when we invoke BSCMAKE, the utility provided by MS to generate code browsing information. This means that once the browsing database is constructed, updates to it will happen incrementally. Earlier, updates were causing the entire database to get created from scratch.

client.mak

@@ -160,7 +160,7 @@ clobber_layout:
 browse_info::
 	cd $(MOZ_SRC)\$(MOZ_TOP)
 	-dir /s /b *.sbr > sbrlist.tmp
-	-bscmake /n /o nglayout.bsc @sbrlist.tmp
+	-bscmake /o nglayout.bsc @sbrlist.tmp
 	-rm sbrlist.tmp
 
 #//------------------------------------------------------------------------