dnsmasq: build with MAKE1

dnsmasq build breaks with parallel builds.
By the time final target needs to be linked, some object files are missing.

Fix it by using MAKE1 instead.

Fixes:
http://autobuild.buildroot.org/results/7a68e2f64105013c1040c01c0e55fb5d910ef8d8



Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>