Fix #68302: impossible to compile php with zip support

We should not let configure succeed, if SIZEOF_OFF_T == 0, just to let the
compilation fail later. Instead we bail out early, giving a hint regarding
the potential issue, namely misconfigured libraries.

Author: cmb69

NEWS

@@ -31,6 +31,9 @@ PHP                                                                        NEWS
 - XML:
   . Fixed bug #72085 (SEGV on unknown address zif_xml_parse). (cmb)
 
+- ZIP:
+  . Fixed bug #68302 (impossible to compile php with zip support). (cmb)
+
 18 Aug 2016, PHP 5.6.25
 
 - Bz2:

ext/zip/config.m4

@@ -148,6 +148,9 @@ AC_CHECK_SIZEOF([int])
 AC_CHECK_SIZEOF([long])
 AC_CHECK_SIZEOF([long long])
 AC_CHECK_SIZEOF([off_t])
+if test "$ac_cv_sizeof_off_t" = "0" ; then
+  AC_MSG_ERROR(off_t undefined; check your library configuration)
+fi
 AC_CHECK_SIZEOF([size_t])
 
 AC_PATH_PROG([TOUCH], [touch])