Add a patch to allow compilation of xapian on android.

kiwixbuild/dependencies/xapian.py

@@ -14,7 +14,10 @@ class Xapian(Dependency):
     class Source(ReleaseDownload):
         archive = Remotefile('xapian-core-1.4.10.tar.xz',
                              '68669327e08544ac88fe3473745dbcae4e8e98d5060b436c4d566f1f78709bb8')
-        patches = ['xapian_sys_types.patch']
+        patches = [
+            'xapian_sys_types.patch',
+            'xapian_fix_include_errno.patch'
+        ]
 
     class Builder(MakeBuilder):
         configure_option = "--disable-sse --disable-backend-chert --disable-backend-inmemory --disable-documentation"

kiwixbuild/patches/xapian_fix_include_errno.patch

@@ -0,0 +1,11 @@
+diff -ur xapian-core-1.4.10/examples/xapian-pos.cc xapian-core-1.4.10.patched/examples/xapian-pos.cc
+--- xapian-core-1.4.10/examples/xapian-pos.cc	2019-02-11 22:27:21.000000000 +0100
++++ xapian-core-1.4.10.patched/examples/xapian-pos.cc	2019-02-18 16:43:08.593354559 +0100
+@@ -29,6 +29,7 @@
+ #include <algorithm>
+ #include <cstdlib>
+ #include <limits>
++#include <errno.h>
+ 
+ #include "gnu_getopt.h"
+ #include "stringutils.h"