testing/libmilter: set default pthread stack size to 8 MB

This patch tries to fix various crashes for applications depending on
libmilter by setting the stack size for pthreads to 8 MB. The default
stack size for musl libc is set to 80 KB whereas glibc has it set
to 8 MB. This causes problems when a large amount of memory is
allocated on the stack.

For example, opendkim allocates blocks of 64 KB multiple times, which
causes libmilter (and therefore opendkim) to crash.
Maybe a stack size of 1 MB or 2 MB would be sufficient, but as opendkim
depends on the default glibc behavior, 8 MB should be safe.

I know this patch is kind of ugly, a better solution may be to file
a request for opendkim to allocate large blocks of memory on the heap.
But as libmilter/opendkim are fairly unusable at the moment, I suggest
to apply this patch as long as these packages are in testing.

Fixes https://bugs.alpinelinux.org/issues/6360

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