Add cassert and GL for docker builds

skia/font_converter/build/premake5.lua

diff --git a/skia/font_converter/build/premake5.lua b/skia/font_converter/build/premake5.lua
index 16f01d1..9bb82c1 100644
--- a/skia/font_converter/build/premake5.lua
+++ b/skia/font_converter/build/premake5.lua
@@ -34,6 +34,7 @@
         "skia",
         "z",
         "dl",
+        "GL"
     }
 end 
 

skia/font_converter/src/font.cpp

diff --git a/skia/font_converter/src/font.cpp b/skia/font_converter/src/font.cpp
index f080832..504739d 100644
--- a/skia/font_converter/src/font.cpp
+++ b/skia/font_converter/src/font.cpp
@@ -1,3 +1,4 @@
+#include <cassert>
 #include "font.h"
 #include "include/core/SkFont.h"