xapian patch to not use hardcoded '-lz' option.

zlib may be installed under the libzlibstatic.a or libzlib.dll.so names.
xapian correctly detect those name but use '-lz' option for xapian_inspec
binary.

kiwix-build.py

@@ -781,7 +781,8 @@ class Xapian(Dependency):
     class Source(ReleaseDownload):
         archive = Remotefile('xapian-core-1.4.0.tar.xz',
                              '10584f57112aa5e9c0e8a89e251aecbf7c582097638bfee79c1fe39a8b6a6477')
-        patches = ["xapian_pkgconfig.patch"]
+        patches = ["xapian_pkgconfig.patch",
+                   "xapian_no_hardcode_lz.patch"]
 
     class Builder(MakeBuilder):
         configure_option = "--disable-sse --disable-backend-inmemory --disable-documentation"

patches/xapian_no_hardcode_lz.patch

@@ -0,0 +1,34 @@
+diff -ur xapian-core-1.4.0/bin/Makefile.mk xapian-core-1.4.0.no_lz/bin/Makefile.mk
+--- xapian-core-1.4.0/bin/Makefile.mk	2016-06-25 17:36:49.000000000 +0200
++++ xapian-core-1.4.0.no_lz/bin/Makefile.mk	2017-02-07 11:15:10.166507000 +0100
+@@ -66,7 +66,7 @@
+ 	unicode/unicode-data.cc\
+ 	unicode/utf8itor.cc
+ 
+-bin_xapian_inspect_LDADD = $(ldflags) libgetopt.la -lz
++bin_xapian_inspect_LDADD = $(ldflags) libgetopt.la $(libxapian_la)
+ 
+ bin_xapian_progsrv_SOURCES = bin/xapian-progsrv.cc
+ bin_xapian_progsrv_LDADD = $(ldflags) libgetopt.la $(libxapian_la)
+diff -ur xapian-core-1.4.0/Makefile.in xapian-core-1.4.0.no_lz/Makefile.in
+--- xapian-core-1.4.0/Makefile.in	2016-06-25 17:39:28.000000000 +0200
++++ xapian-core-1.4.0.no_lz/Makefile.in	2017-02-07 11:27:21.050507000 +0100
+@@ -707,7 +707,8 @@
+ 	unicode/bin_xapian_inspect-unicode-data.$(OBJEXT) \
+ 	unicode/bin_xapian_inspect-utf8itor.$(OBJEXT)
+ bin_xapian_inspect_OBJECTS = $(am_bin_xapian_inspect_OBJECTS)
+-bin_xapian_inspect_DEPENDENCIES = $(am__DEPENDENCIES_1) libgetopt.la
++bin_xapian_inspect_DEPENDENCIES = $(am__DEPENDENCIES_1) libgetopt.la \
++	$(libxapian_la)
+ am_bin_xapian_progsrv_OBJECTS = bin/xapian-progsrv.$(OBJEXT)
+ bin_xapian_progsrv_OBJECTS = $(am_bin_xapian_progsrv_OBJECTS)
+ bin_xapian_progsrv_DEPENDENCIES = $(am__DEPENDENCIES_1) libgetopt.la \
+@@ -1405,7 +1406,7 @@
+ 	unicode/unicode-data.cc\
+ 	unicode/utf8itor.cc
+ 
+-bin_xapian_inspect_LDADD = $(ldflags) libgetopt.la -lz
++bin_xapian_inspect_LDADD = $(ldflags) libgetopt.la $(libxapian_la)
+ bin_xapian_progsrv_SOURCES = bin/xapian-progsrv.cc
+ bin_xapian_progsrv_LDADD = $(ldflags) libgetopt.la $(libxapian_la)
+ bin_xapian_replicate_SOURCES = bin/xapian-replicate.cc