package/madplay: add custom libtool patch

madplay use a libtool script in version 1.5.2 but the libtool patch
"buildroot-libtool-v1.5.patch.patch" doesn't apply.

From [1]:
"It's libtool dropping -static. That's because madplay has a
weird version of libtool, on which our libtool patch doesn't apply so
we have MADPLAY_LIBTOOL_PATCH = NO. Therefore, the hack we have that
makes libtool -static behave like -all-static isn't applied, causing
this build failure."

Fixes:
http://autobuild.buildroot.net/results/60def1b15ea61d3cb5f50e9de3f354dd2e17d270

[1] http://lists.busybox.net/pipermail/buildroot/2017-May/192959.html



Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>