Fix and improve build script

lib/font_renderer/build.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+cxxcompiler="g++"
+cxxflags="-Wall -O3 -g -std=c++03 -fno-exceptions -fno-rtti -Isrc -Ilib/font_renderer"
+cxxflags+=" -DFONT_RENDERER_HEIGHT_HACK"
+for package in libagg freetype2; do
+  cxxflags+=" $(pkg-config --cflags $package)"
+done
+
+echo "compiling font renderer library..."
+
+for f in `find lib -name "*.cpp"`; do
+  $cxxcompiler -c $cxxflags $f -o "${f//\//_}.o"
+  if [[ $? -ne 0 ]]; then
+    got_error=true
+  fi
+done
+
+if [[ $got_error ]]; then
+  rm -f *.o
+  exit 1
+fi
+
+ar -rcs libfontrenderer.a *.o
+
+rm *.o
+echo "font renderer library created"