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Build failure with -std=c99 on arm64 Macs due to assembly syntax

Hello, MacPorts users report being unable to build orc 0.4.35 on macOS with Apple Silicon / arm64 / aarch64 processors.

The error is:

../orc-0.4.35/orc-test/orctest.c:68:22: error: expected ')' 
  asm("msr FPCR, %0" : : "r" (fpcr_value));
                     ^   
../orc-0.4.35/orc-test/orctest.c:68:6: note: to match this '(' 
  asm("msr FPCR, %0" : : "r" (fpcr_value));
     ^   
1 error generated.

The code in question is here:

https://gitlab.freedesktop.org/gstreamer/orc/-/blob/887392103956a8733a750c4442e2664d5c26527d/orc-test/orctest.c#L67-73

Perhaps this is GNU-specific assembler syntax. We are compiling with clang, as is customary on macOS. Clang does define __GNUC__.