Fix #78348: Remove -lrt from pdo_sqlite.so

The fdatasync check has been removed since PHP 5.3.

The Solaris fix was introduced via
8d63360
and is today no longer relevant since the sqlite library is neither
bundled in php-src anymore neither the check needs to be done via the
PHP build system.

Closes GH-4485

ext/pdo_sqlite/config.m4

@@ -35,8 +35,5 @@ if test "$PHP_PDO_SQLITE" != "no"; then
   PHP_NEW_EXTENSION(pdo_sqlite, pdo_sqlite.c sqlite_driver.c sqlite_statement.c,
     $ext_shared,,-I$pdo_cv_inc_path)
 
-  dnl Solaris fix
-  PHP_CHECK_LIBRARY(rt, fdatasync, [PHP_ADD_LIBRARY(rt,, PDO_SQLITE_SHARED_LIBADD)])
-
   PHP_ADD_EXTENSION_DEP(pdo_sqlite, pdo)
 fi