toolchain.defs: Remove absolute path

Avoid hard-coded absolute paths.
Assume gcc and ar will be found using $PATH.

Change-Id: Ie7bd7d262a56a20741c8b3e5c1d0d600d8a1b60d
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
diff --git a/make/host/toolchain.defs b/make/host/toolchain.defs
index d80849d..9b4875a 100644
--- a/make/host/toolchain.defs
+++ b/make/host/toolchain.defs
@@ -31,10 +31,10 @@
 #
 
 # compilers
-vCC_linux2 = /usr/bin/gcc
+vCC_linux2 = gcc
 
 # archivers
-vAR_linux2 = /usr/bin/ar
+vAR_linux2 = ar
 
 #add in any extra hosts to build for
 sinclude ${VXMICRO_BASE}/make/host/toolchain_extra.defs