audio/pulseaudio: fix build on armv7
The inline assembly template modifier h is not supported by clang. With
gcc, it prints a 128 bit NEON register as a pair of halves. Emulate its
effect through the e and f modifiers, which are supported by both.
Approved by: portmgr (build fix blanket)
MFH: 2023Q4
(cherry picked from commit 3dd02a0fe712c2b67ab0e15444d9fbb4f00b3817)