environment: Detect sun4u and sun4v as sparc64
Solaris returns these values.
Fixes
@@ -330,6 +330,8 @@ def detect_cpu_family(compilers: CompilersDict) -> str:
trial = 'ppc'
elif trial in ('amd64', 'x64', 'i86pc'):
trial = 'x86_64'
+ elif trial in {'sun4u', 'sun4v'}:
+ trial = 'sparc64'
# On Linux (and maybe others) there can be any mixture of 32/64 bit code in
# the kernel, Python, system, 32-bit chroot on 64-bit host, etc. The only
