lzma: repair build

The build of host-lzma is broken since commit 97703978
("support/libtool: make -static behave like -all-static").

Lzma forces '-static' in its LDFLAGS, which contradicts what buildroot tries to
achieve by patching libtool scripts and configuring host packages with
'--disable-static'.

We add a patch to remove lzma's hardcoded LDFLAGS, to fix the build.

Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>