Fix cygwin 32-bit compile

poppler/goo/gfile.cc: In function ‘GBool openTempFile(GooString**, FILE**, const char*)’:
poppler/goo/gfile.cc:409:37: error: ‘mkstemp’ was not declared in this scope
   fd = mkstemp((*name)->getCString());
                                     ^
poppler/goo/gfile.cc:417:39: error: ‘fdopen’ was not declared in this scope
   if (fd < 0 || !(*f = fdopen(fd, mode))) {
                                       ^
poppler/goo/gfile.cc: In function ‘int Gfseek(FILE*, Goffset, int)’:
poppler/goo/gfile.cc:558:34: error: ‘fseeko’ was not declared in this scope
   return fseeko(f, offset, whence);
                                  ^
poppler/goo/gfile.cc: In function ‘Goffset Gftell(FILE*)’:
poppler/goo/gfile.cc:572:18: error: ‘ftello’ was not declared in this scope
   return ftello(f);
                  ^
2 files changed