Support MakefileGemList for MRUBY_CFLAGS and MRUBY_LDFLAGS

Other apps using mruby like mod_mruby easy to link mrbgems dynamically by MakefileGemList

mrbgems/Makefile4gem

@@ -124,7 +124,7 @@ gem-clean-rb-files :
 
 
 %.o : %.c
-	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(GEM_INCLUDE_LIST) $< -o $@
+	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(GEM_CFLAGS_LIST) $< -o $@
 
 .PHONY : clean
 clean : gem-clean

mrbgems/build_tasks.rb

@@ -113,7 +113,8 @@ GEM_LIST := #{for_each_gem{|path, gemname| "#{path}/mrb-#{gemname}-gem.a "}}
 GEM_ARCHIVE_FILES := #{MRUBY_ROOT}/mrbgems/gem_init.a
 GEM_ARCHIVE_FILES += $(GEM_LIST)
 
-GEM_INCLUDE_LIST := #{for_each_gem{|path, gemname| "-I#{path}/include "}}
+GEM_CFLAGS_LIST := #{for_each_gem{|path, gemname| "#{File.read("#{path}/gem-cflags.tmp").chomp} "}}
+GEM_LDFLAGS_LIST := #{for_each_gem{|path, gemname| "#{File.read("#{path}/gem-ldflags.tmp").chomp} "}}
 __EOF__
   end
 end