mozjs: tweak location of tmp dir creation

The tmp dir creation is out of build dir which has
the risk to be broken by others.
...
|   File "build/tmp-glibc/work/i586-wrs-linux/mozjs/52.8.1-r0/
mozjs-52.8.1/build/moz.configure/util.configure", line 190,
in try_invoke_compiler
|     os.remove(path)
| OSError: [Errno 2] No such file or directory: '/tmp/conftest.OiV37V.cpp'
...

Set var-TMP for tempfile.mktemp to use current build dir to
replace default `/tmp'.

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-extended/mozjs/mozjs_52.8.1.bb

@@ -51,6 +51,7 @@ EXTRA_OEMAKE_task-install += "STATIC_LIBRARY_NAME=js_static"
 
 do_configure() {
     export SHELL="/bin/sh"
+    export TMP="${B}"
     ${S}/js/src/configure ${EXTRA_OECONF}
 }