build: changes order in which paths are added to $PATH

MinGW expects to have new program locations added to
the end of the PATH variable.

Change-Id: Ifd31b63c9ef39a7f2b416ffef39461290c822dd7
Signed-off-by: Juan Manuel Cruz <juan.m.cruz.alcaraz@intel.com>
Signed-off-by: Yonattan Louise <yonattan.a.louise.mendoza@intel.com>

zephyr-env.sh

@@ -15,7 +15,7 @@ export ZEPHYR_BASE=$( builtin cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd ${MIN
 
 scripts_path=${ZEPHYR_BASE}/scripts
 echo "${PATH}" | grep -q "${scripts_path}"
-[ $? != 0 ] && export PATH=${scripts_path}:${PATH}
+[ $? != 0 ] && export PATH=${PATH}:${scripts_path}
 unset scripts_path
 
 # enable custom environment settings