fix link error on Mac OS X 10.5

[Bruno Haible]

On Mac OS X 10.5 I get this link error:

Undefined symbols:
  "_strndup", referenced from:
      _pk_completion_function in libpoke_la-libpoke.o
      _pkl_struct_type_traverse in libpoke_la-pkl-ast.o
      _pkl_trans1_ps_print_stmt in libpoke_la-pkl-trans.o
      _pkl_trans1_ps_print_stmt in libpoke_la-pkl-trans.o
  "_rpl_fopen", referenced from:
      _pkl_execute_file in libpoke_la-pkl.o
      _load_module in libpoke_la-pkl-tab.o
      _pkl_detailed_location in libpoke_la-pkl-diag.o
      _ios_dev_file_open in libpoke_la-ios-dev-file.o
      _ios_dev_file_open in libpoke_la-ios-dev-file.o
      _ios_dev_file_open in libpoke_la-ios-dev-file.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [libpoke.la] Error 1

Again, the cause is that the source files (fopen.c and strndup.c, this time)
are present in gl/ but not in gl-libpoke/.

Here's a proposed fix.

0005-Fix-build-error-on-Mac-OS-X-10.5.patch
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