caps: Mark ARCH empty

This is to ensure that if ARCH is set in Makefiles then
its not used. This variable is generated using uname which
is wrong for cross compile. So we dont want to set it accidently

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-multimedia/recipes-multimedia/caps/caps_0.9.24.bb

@@ -17,6 +17,7 @@ S = "${WORKDIR}/${PN}-${PV}"
 EXTRA_OEMAKE = " \
     CC='${CXX}' \
     CFLAGS='${CFLAGS} -ffast-math -funroll-loops -fPIC -DPIC' \
+    ARCH='' \
 "
 do_compile() {
     oe_runmake all