Add small test program for stb_truetype

tests/meson.build

@@ -0,0 +1,18 @@
+lite_sources = [
+    'api/api.c',
+    'api/renderer.c',
+    'api/renderer_font.c',
+    'api/system.c',
+    'renderer.c',
+    'agg_font_freetype.cpp',
+    'font_render_capi.cpp',
+    'rencache.c',
+    'main.c',
+]
+
+executable('stb-font-render-test',
+    'stb_font_render_test.c',
+    include_directories: lite_include,
+    dependencies: [sdl_dep, stb_truetype_dep, libm, libdl],
+    install: false,
+)