lok: symbolic link to the "include" directory when builddir != srcdir

When compiling the android variant build in a different build output directory
of the "online" project, it fails due to the missing "include" files.

Change-Id: If9056788b3d043e4ae8ad3f799885995c0ab0cf0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/95603
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Henry Castro <hcastro@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/98269
Tested-by: Jenkins
diff --git a/configure.ac b/configure.ac
index f049233..0be03f3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13518,6 +13518,8 @@ CFLAGS=$my_original_CFLAGS
CXXFLAGS=$my_original_CXXFLAGS
CPPFLAGS=$my_original_CPPFLAGS

AC_LINK_FILES([include], [include])

# Keep in sync with list of files far up, at AC_MSG_CHECKING([for
# BUILD platform configuration] - otherwise breaks cross building
AC_CONFIG_FILES([config_host.mk