Merge pull request #409 from sodabrew/incflags_not_cflags

Use mysql_config --include instead of --cflags

Author: brianmario

ext/mysql2/extconf.rb

@@ -42,15 +42,15 @@ def asplode lib
 elsif mc = (with_config('mysql-config') || Dir[GLOB].first) then
   mc = Dir[GLOB].first if mc == true
   ver = `#{mc} --version`.chomp.to_f
-  cflags = `#{mc} --cflags`.chomp
+  includes = `#{mc} --include`.chomp
   exit 1 if $? != 0
   libs = `#{mc} --libs_r`.chomp
   # MySQL 5.5 and above already have re-entrant code in libmysqlclient (no _r).
   if ver >= 5.5 || libs.empty?
     libs = `#{mc} --libs`.chomp
   end
   exit 1 if $? != 0
-  $CPPFLAGS += ' ' + cflags
+  $INCFLAGS += ' ' + includes
   $libs = libs + " " + $libs
 else
   inc, lib = dir_config('mysql', '/usr/local')