misc: Only include rbpaths.h and string-extra.h in places that need it

(Don't include rbpaths.h in settings.h, or string-extra.h in rbpaths.h)

Build-tested on rocker, erosq, mini2g, nano2g,
                xduoox3, clipzip, dx50, and uisim

Change-Id: If32e9c9910f5c8247a655cb64522b84d6d7ccbb5

firmware/drivers/audio/erosqlinux_codec.c

@@ -20,9 +20,6 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
-#define RB_FILESYSTEM_OS  // VERY important this is before settings.h
-                          // because that pulls in rbpaths.h which breaks open()
-
 //#define LOGF_ENABLE
 
 #include "config.h"

firmware/export/rbpaths.h

@@ -24,8 +24,6 @@
 
 #include <stdbool.h>
 #include "autoconf.h"
-#include "string-extra.h"
-
 
 /* name of directory where configuration, fonts and other data
  * files are stored */

firmware/font.c

@@ -34,6 +34,7 @@
 #include "system.h"
 #include "kernel.h"
 #include "lcd.h"
+#include "string-extra.h"
 #include "font.h"
 #include "file.h"
 #include "core_alloc.h"