Update bindep-fallback for openSUSE 15.0
openSUSE 15.0 does not have libffi48-devel, instead we can use
libffi-devel. Install libffi48-devel only on openSUSE 42.3.
This was triggered by the failure in
@@ -24,8 +24,8 @@ libevent-dev [platform:dpkg]
libevent-devel [platform:rpm]
dev-libs/libevent [platform:gentoo]
libffi-dev [platform:dpkg]
-libffi-devel [platform:redhat]
-libffi48-devel [platform:suse]
+libffi-devel [platform:redhat platform:suse !platform:opensuse423]
+libffi48-devel [platform:opensuse423]
virtual/libffi [platform:gentoo]
libjerasure-dev [platform:ubuntu]
dev-libs/jerasure [platform:gentoo]
