Update wscript in accordance to current node_addon.py
Update wscript in accordance to current node_addon.py

  * Put preprocessor defines into CPPFLAGS not compile flags
  * Remove -g flag, all addons should have debugging symbols

Sannis/node-mysql-libmysqlclient,beni55/node-mysql-libmysqlclient,Sannis/node-mysql-libmysqlclient,beni55/node-mysql-libmysqlclient,beni55/node-mysql-libmysqlclient,beni55/node-mysql-libmysqlclient,beni55/node-mysql-libmysqlclient,Sannis/node-mysql-libmysqlclient,Sannis/node-mysql-libmysqlclient