Squashed 'external/stb/stb/' content from commit c39c7023e

git-subtree-dir: external/stb/stb
git-subtree-split: c39c7023ebb833ce099750fe35509aca5662695e

tests/test_easyfont.c

@@ -0,0 +1,10 @@
+#include "stb_easy_font.h"
+
+void ef_dummy(void)
+{
+   // suppress unsused-function warning
+   stb_easy_font_spacing(0);
+   stb_easy_font_print(0,0,0,0,0,0);
+   stb_easy_font_width(0);
+   stb_easy_font_height(0);
+}