media-libs/nas: workaround imake argument splitting

IMAKECPP normally doesn't support arguments but was given
the same basic support as IMAKEINCLUDE which doesn't handle
multiple spaces or tab, and an empty get_abi_CFLAGS would
result in two spaces without an argument.

So use an array and word splitting to normalize.

Closes: https://bugs.gentoo.org/884203
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

media-libs/nas/nas-1.9.5.ebuild

@@ -53,8 +53,10 @@ multilib_src_configure() {
 	pushd config || die
 	econf
 	popd || die
+
+	local cpp=($(get_abi_CHOST ${DEFAULT_ABI})-gcc $(get_abi_CFLAGS) -E) #884203
 	CC="$(tc-getBUILD_CC)" LD="$(tc-getLD)" \
-		IMAKECPP="${IMAKECPP:-$(get_abi_CHOST ${DEFAULT_ABI})-gcc $(get_abi_CFLAGS) -E}" \
+		IMAKECPP="${IMAKECPP:-${cpp[*]}}" \
 		xmkmf -a || die
 }