Add a patch to fix libxml2.la's path

[nurse]

fix #1941

BSD make seemds to need the prefix correctly.

[codeclimate]

Code Climate has analyzed commit 7cfb784 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 46.3% (0.0% change).

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[flavorjones]

Thank you! Merged and shipped in v1.10.6 just now.

[franzliedke]

This unfortunately breaks gem installation on my machine:

Running patch with
/builds/gitlab/vendor/ruby/2.6.0/gems/nokogiri-1.10.6/patches/libxml2/0004-libxml2.la-is-in-top_builddir.patch...
ERROR, review
'/builds/gitlab/vendor/ruby/2.6.0/gems/nokogiri-1.10.6/ext/nokogiri/tmp/x86_64-pc-linux-gnu/ports/libxml2/2.9.10/patch.log'
to see what happened. Last lines are:
========================================================================
patching file HTMLtree.c
Hunk #1 succeeded at 706 (offset -11 lines).
patching file entities.c
patching file entities.c
can't find file to patch at input line 3
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|--- Makefile.in.orig	2019-12-04 06:31:23.930568000 +0900
|+++ Makefile.in	2019-12-04 06:31:26.838389000 +0900
--------------------------
File to patch: 
Skip this patch? [y] 
Skipping patch.
1 out of 1 hunk ignored
========================================================================
*** extconf.rb failed ***

[franzliedke]

Ah, already reported and fixed in #1954, sorry.

[flavorjones]

Yes - v1.10.7 should fix this. Sorry for the hassle!