[sparc64] fix pulseaudio 15.0 build

The patch below makes pulseaudio build on sparc64.

The problem is that the determination of libintl_dep works as intended
with base-clang but fails with ports-gcc (*). Thus, pacat and a couple
other programs are linked without -lintl on sparc64, which won't work.

http://build-failures.rhaalovely.net/sparc64/2021-09-18/audio/pulseaudio.log

I did not bump revision, since this should not change anything on
architectures where pulseaudio 15.0 already builds.


(*) Meson uses the test program below which compiles with

egcc -L/usr/local/lib -I/usr/local/include testfile.c -o test.out -O2 -pipe -O0 -std=gnu11

but doesn't compile with clang.

int main(void) {
/* With some toolchains (MSYS2/mingw for example) the compiler
* provides various builtins which are not really implemented and
* fall back to the stdlib where they aren't provided and fail at
* build/link time. In case the user provides a header, including
* the header didn't lead to the function being defined, and the
* function we are checking isn't a builtin itself we assume the
* builtin is not functional and we just error out. */
#if !1 && !defined(dgettext) && !0
#error "No definition for __builtin_dgettext found in the prefix"