Fixed a number of dll separation issues.

diff --git a/objects/bitmap.c b/objects/bitmap.c
index 8ddfd3b..46080a8 100644
--- a/objects/bitmap.c
+++ b/objects/bitmap.c
@@ -53,7 +53,7 @@
  * Return number of bytes taken by a scanline of 16-bit aligned Windows DDB
  * data.
  */
-INT BITMAP_GetWidthBytes( INT bmWidth, INT bpp )
+static INT BITMAP_GetWidthBytes( INT bmWidth, INT bpp )
 {
     switch(bpp)
     {