Description:
------------
The library test for external SQLite3 libraries fails on Solaris 10
as it does not include -lrt and consequently always fails.

When building with bundled sqlite3 library, there is a test
for -lrt on line 122 of ext/pdo_sqlite/config.m4:

dnl Solaris fix
PHP_CHECK_LIBRARY(rt, fdatasync, [
   PHP_ADD_LIBRARY(rt,, PDO_SQLITE_SHARED_LIBADD)])

This test could be moved so it's usable by both the bundled and
non-bundled builds.

(I'd offer a patch but my M4 foo is weak)


Reproduce code:
---------------
shell:
./configure --prefix=/usr/local --with-pdo-sqlite=shared,/usr/local
*snip*
checking for sqlite 3 support for PDO... yes, shared
checking for PDO includes... (cached) /export/work/php-5.2.3/ext
checking for sqlite3_open in -lsqlite3... no
configure: error: wrong sqlite lib version or lib not found

config.log:
configure:76889: cc -o conftest -I/usr/include -O -I/usr/local/include -D_POSIX_PTHREAD_SEMANTICS -R/usr/local/lib -L/usr/local/lib -L/usr/lib -L/usr/local/
lib -R/usr/local/lib  -R/usr/ucblib -L/usr/ucblib -R/usr/local/lib -L/usr/local/lib -lm conftest.c -lsqlite3  -lintl -lbz2 -lz -lpcre -lresolv -lm -lnsl -ls
ocket  -lxml2 -lz -lm -lsocket -lnsl -lxml2 -lz -lm -lsocket -lnsl 1>&5
Undefined                       first referenced
 symbol                             in file
fdatasync                           /usr/local/lib/libsqlite3.so
ld: fatal: Symbol referencing errors. No output written to conftest
configure: failed program was:
#line 76878 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char sqlite3_open();

int main() {
sqlite3_open()
; return 0; }