Revert back to old compiler since gcc-6 for some very strange reason destroyed performance (#2683)

* Newer compiler

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

* Update libreactor.sh

toolset/setup/linux/frameworks/libreactor.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-fw_depends gcc-6
+fw_depends gcc-4.9
 
 fw_installed libreactor && return 0
 
@@ -8,9 +8,11 @@ LIBREACTOR_HOME=$IROOT/libreactor_techempower
 
 git clone https://github.com/fredrikwidlund/libreactor_techempower
 cd $LIBREACTOR_HOME
-export CC=gcc-6
-export RANLIB=gcc-ranlib-6
-export AR=gcc-ar-6
+# 4/14/2017
+git checkout 675ccca0fb74a5161f8c0eae806d9a275b63a50c
+export CC=gcc-4.9
+export RANLIB=gcc-ranlib-4.9
+export AR=gcc-ar-4.9
 ./autogen.sh
 ./configure
 make