If a CPUTYPE isn't specified, then don't use -march=k8 when compiling 32-bit compat libs on amd64 since -march=k8 may generate instructions that are not implemented on Intel EM64T processors.  Instead, use a simpler set of default flags that should work on all amd64-capable CPUs.
If a CPUTYPE isn't specified, then don't use -march=k8 when compiling
32-bit compat libs on amd64 since -march=k8 may generate instructions
that are not implemented on Intel EM64T processors.  Instead, use
a simpler set of default flags that should work on all amd64-capable
CPUs.

PR:		amd64/113111
Submitted by:	NIIMI Satoshi  sa2c of sa2c.net
MFC after:	1 week

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