重装apache2，增加proxy模块

make reinstall WITH_AUTH_MODULES=yes WITH_EXPERIMENTAL_MODULES=yes WITH_MISC_MODULES=yes WITH_PROXY_MODULES=yes WITH_MODULES=”proxy gzip”

make reinstall WITH_AUTH_MODULES=yes WITH_EXPERIMENTAL_MODULES=yes WITH_MISC_MODULES=yes WITH_PROXY_MODULES=yes WITH_MODULES=”proxy gzip”