* XCode 2.x only comes with automake 1.6.3, and that doesn't know
  per-object CPPFLAGS, thus use per-object CFLAGS instead
* also it is picky about redefining the SOURCES in a conditional
  statement, so use a variable in a condition instead and add that
* Its linker also needs help locating libs that are using the
  relocation-placeholders, thus add -dylib_file linkerflag
* aclocal insists on a space between -I and argument

Change-Id: I35714a1a76a7b7823ee6b64a3296aeae96e7296a
Reviewed-on: https://gerrit.libreoffice.org/605Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>