Fixing fonts to use constant color instead of variable.

Change-Id: Ia590dfed482f82b7bc748c25b7b1592efea5b68c
diff --git a/libs/rs/rsFont.h b/libs/rs/rsFont.h
index 2d9a34a..ab229be 100644
--- a/libs/rs/rsFont.h
+++ b/libs/rs/rsFont.h
@@ -117,6 +117,7 @@
     void renderText(Allocation *alloc, uint32_t start, int len, int x, int y);
 
     void setFontColor(float r, float g, float b, float a);
+    void getFontColor(float *r, float *g, float *b, float *a) const;
 
 protected: