VirtualBox-6.0.6 fails build under 8.99.39

[Chavdar Ivanov <ci4ic4%gmail.com@localhost>]

Hi,

While The said version compiles cleanly under 8.99.37 (I did it a few
days ago), today under 8.99.39 it fails for me as follows:
....
/p/VirtualBox-6.0.6/out/netbsd.amd64/release/obj/netbsd/include/x86/cpufunc.h:
In function 'x86_pause':
/p/VirtualBox-6.0.6/out/netbsd.amd64/release/obj/netbsd/include/x86/cpufunc.h:50:2:
error: 'asm' undeclared (first use in this function)
  asm volatile ("pause");
  ^~~
/p/VirtualBox-6.0.6/out/netbsd.amd64/release/obj/netbsd/include/x86/cpufunc.h:50:2:
note: each undeclared identifier is reported only once for each functi
on it appears in
/p/VirtualBox-6.0.6/out/netbsd.amd64/release/obj/netbsd/include/x86/cpufunc.h:50:6:
error: expected ';' before 'volatile'
  asm volatile ("pause");
      ^~~~~~~~

.....


and that repeats for many lines after.

Any reason for this?

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