dbtool: Fix it up so that it runs from the CURRENT working directory

This makes it far more useful, as before it insisted on scanning from
the root directory and putting the generated db files in /.rockbox

Change-Id: I0d0e3c6c6c7ee1fc5473185482fbfb9a2a2be29f

tools/configure

@@ -4270,7 +4270,7 @@ fi
       simcc "database-sdl"
       toolset='';
       appsdir='$(ROOTDIR)/tools/database';
-
+      rbdir="./.rockbox"
       case $uname in
           CYGWIN*|MINGW*)
               output="database_${modelname}.exe"

tools/database/database.c

@@ -23,7 +23,7 @@ int main(int argc, char **argv)
 
     /* / is actually ., will get translated in io.c
      * (with the help of sim_root_dir below */
-    const char *paths[] = { "/", NULL };
+    const char *paths[] = { "./", NULL };
     tagcache_init();
     do_tagcache_build(paths);
     tagcache_reverse_scan();