Use AC_COMPILE_IFELSE because AC_TRY_COMPILE is deprecated.
Include cdefs.h because it has checks for architcture.

This patch fixes a problem caused by special regex characters
appearing in the device names when using the Jack interface to PipeWire.

It is uncommon for JACK ports to have any characters that need to
be escaped in a regex. jackd simply calls the audio interface
"system". However PipeWire uses the device name from ALSA for the
JACK port names. If this contains any special regex characters,
BuildDeviceList would find the device but determine it has 0
input channels and 0 output channels. In my case, I have an RME
Babyface Pro which puts its serial number in parentheses:

$ aplay -l
card 0: Pro70785713 [Babyface Pro (70785713)], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0