Excempt yet another file from old-style-cast checking

text.cpp was also excempted in the cmake build but didn't generate an
error when I tested locally. Adding more the same pragma there to
disable it both cmake and scons.

src/text.cpp

@@ -31,6 +31,8 @@
 
 #include "video.hpp"
 
+#pragma GCC diagnostic ignored "-Wold-style-cast"
+
 namespace font {
 
 namespace {