Fix serious socket leakage introduced by optimization (#2691)

* Newer compiler

* Revert back to old compiler since gcc-6 for some very strange reason destroyed performance

* Update libreactor.sh

* Fix serious socket leakage introduced by optimization

toolset/setup/linux/frameworks/libreactor.sh

@@ -9,7 +9,7 @@ LIBREACTOR_HOME=$IROOT/libreactor_techempower
 git clone https://github.com/fredrikwidlund/libreactor_techempower
 cd $LIBREACTOR_HOME
 # 4/14/2017
-git checkout 675ccca0fb74a5161f8c0eae806d9a275b63a50c
+git checkout c96da1fa46d3de3618755d8b578b6b4db48ccd3b
 export CC=gcc-4.9
 export RANLIB=gcc-ranlib-4.9
 export AR=gcc-ar-4.9