Fix missing liburiparser linker option

[remicollet]

Drop URI_SHARED_LIBADD usage (only needed for a shared extension), use global Autoconf LIBS variable instead

This fix build with external liburiparser (strangely seems only out of sources tree)

/usr/bin/ld: ext/uri/php_uri.o: in function `zm_info_uri':
/builddir/build/BUILD/php-8.5.2_RC1-build/php-8.5.2RC1/ext/uri/php_uri.c:1128:(.text.unlikely+0x1db): undefined reference to `uriBaseRuntimeVersionA'
/usr/bin/ld: ext/uri/uri_parser_rfc3986.o: in function `copy_uri':
/builddir/build/BUILD/php-8.5.2_RC1-build/php-8.5.2RC1/ext/uri/uri_parser_rfc3986.c:82:(.text+0x95): undefined reference to `uriCopyUriMmA'
/usr/bin/ld: ext/uri/uri_parser_rfc3986.o: in function `php_uri_parser_rfc3986_destroy':
/builddir/build/BUILD/php-8.5.2_RC1-build/php-8.5.2RC1/ext/uri/uri_parser_rfc3986.c:612:(.text+0xcd): undefined reference to `uriFreeUriMembersMmA'
/usr/bin/ld: /builddir/build/BUILD/php-8.5.2_RC1-build/php-8.5.2RC1/ext/uri/uri_parser_rfc3986.c:613:(.text+0xe0): undefined reference to `uriFreeUriMembersMmA'
/usr/bin/ld: ext/uri/uri_parser_rfc3986.o: in function `php_uri_parser_rfc3986_fragment_write':
/builddir/build/BUILD/php-8.5.2_RC1-build/php-8.5.2RC1/ext/uri/uri_parser_rfc3986.c:457:(.text+0x124): undefined reference to `uriSetFragmentMmA'
/usr/bin/ld: /builddir/build/BUILD/php-8.5.2_RC1-build/php-8.5.2RC1/ext/uri/uri_parser_rfc3986.c:455:(.text+0x13c): undefined reference to `uriSetFragmentMmA'
/usr/bin/ld: ext/uri/uri_parser_rfc3986.o: in function `php_uri_parser_rfc3986_query_write':

...snipped...

[remicollet]

@DanielEScherzer, if pass review, nice to have in release branch for 8.5.2

Notice: this feature (external liburiparser) is quite new, as version 1.0.0 is required and was very recently released (Dec 15th), so for now, most users don't use it. But this is a best practice (system libraries) for downstream packaging (in Linux distro)

[TimWolla]

I am not really fluent with the autotools. Given that you introduced the line yourself in #18886 I trust you with this change.