[Bug 209921] editors/libreoffice: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209921

            Bug ID: 209921
           Summary: editors/libreoffice: Fix build with libc++ 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: office at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: office at FreeBSD.org
             Flags: maintainer-feedback?(office at FreeBSD.org)

Created attachment 170898
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170898&action=edit
Work around -isystem strangeness in libreoffice build system

After libc++ 3.8.0 was imported in r300770 (see also bug 208158), Antoine found
that editors/libreoffice failed with the following errors [1]:

In file included from
/wrkdirs/usr/ports/editors/libreoffice/work/libreoffice-5.0.6.3/ucb/source/ucp/webdav/AprEnv.cxx:20:
In file included from
/wrkdirs/usr/ports/editors/libreoffice/work/libreoffice-5.0.6.3/ucb/source/ucp/webdav/AprEnv.hxx:25:
In file included from
/wrkdirs/usr/ports/editors/libreoffice/work/libreoffice-5.0.6.3/ucb/source/ucp/webdav/SerfLockStore.hxx:24:
In file included from /usr/include/c++/v1/map:442:
In file included from /usr/include/c++/v1/__tree:15:
In file included from /usr/include/c++/v1/iterator:343:
In file included from /usr/include/c++/v1/__functional_base:15:
In file included from /usr/include/c++/v1/type_traits:363:
/usr/include/c++/v1/cstddef:43:15: fatal error: 'stddef.h' file not found
#include_next <stddef.h>
              ^
1 error generated.

This is because libreoffice's build system transforms some of the -I options
passed via the port Makefile to -isystem, and one of those options is
-I/usr/include, which screws up the include path order for C++ programs.  It
turns out the -I/usr/include path is brought in via OPENSSL_CFLAGS, so set that
to a single space to work around this.  (Note that OPENSSL_CFLAGS cannot be
empty, otherwise the configure script will complain about not being able to
find openssl.)

[1]
http://beefy4.nyi.freebsd.org/data/head-amd64-default/p415968_s300895/logs/errors/libreoffice-5.0.6.log

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