Implement gr_line() and gr_render_circle()

Change-Id: I63c8dcfa276bbeb550ca051a3a1a0646a2d07dc6
Signed-off-by: Vojtech Bocek <vbocek@gmail.com>
diff --git a/minuitwrp/minui.h b/minuitwrp/minui.h
index 8ef0444..6033da7 100644
--- a/minuitwrp/minui.h
+++ b/minuitwrp/minui.h
@@ -39,6 +39,8 @@
 void gr_clip(int x, int y, int w, int h);
 void gr_noclip();
 void gr_fill(int x, int y, int w, int h);
+void gr_line(int x0, int y0, int x1, int y1, int width);
+gr_surface gr_render_circle(int radius, unsigned char r, unsigned char g, unsigned char b, unsigned char a);
 
 int gr_textEx(int x, int y, const char *s, void* font);
 int gr_textExW(int x, int y, const char *s, void* font, int max_width);