tests/linux: use Akaros's CFLAGS

Particularly annoying was the lack of -Wno-format.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

tests/linux/Makefile

diff --git a/tests/linux/Makefile b/tests/linux/Makefile
index bbb51be..cdae90b 100644
--- a/tests/linux/Makefile
+++ b/tests/linux/Makefile
@@ -23,7 +23,7 @@
 # These are the flags Linux uses for modules that are applicable to userspace.
 # Note that this overloads the CFLAGS above.  Just pick one based on whichever
 # comparison you're doing
-HOSTCFLAGS =  \
+#HOSTCFLAGS =  \
   -fno-strict-aliasing \
   -fno-common \
   -fshort-wchar \