Revert "Temporary hack for iOS: open files read-only if read-write open fails"

This reverts commit bdbb0d1c.  Assumed to no
longer be necessary after 9906c6d2
"rhbz#1559633: Treat EPERM same as EACCES when opening files".

Conflicts:
	sal/osl/unx/file.cxx

Change-Id: I9f7ef544da3fec00810cd1d55bb52bf0470d1054
Reviewed-on: https://gerrit.libreoffice.org/51979Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Jenkins <ci@libreoffice.org>

sal/osl/unx/file.cxx

@@ -940,20 +940,6 @@ oslFileError openFilePath(const char *cpFilePath, oslFileHandle* pHandle, sal_uI
 
     /* open the file */
     int fd = open_c( cpFilePath, flags, mode );
-
-#ifdef IOS
-    /* Horrible hack: If opening for RDWR and getting EPERM, just try
-     * again for RDONLY. Quicker this way than to figure out why
-     * we get that oh so useful General Error when trying to open a
-     * read-only document.
-     */
-    if (fd  == -1 && (flags & O_RDWR) && errno == EPERM)
-    {
-        int rdonly_flags = (flags & ~O_ACCMODE) | O_RDONLY;
-        fd = open_c( cpFilePath, rdonly_flags, mode );
-    }
-#endif
-
     if (fd == -1)
     {
         int saved_errno = errno;