testsuite: analyzer: expect alignment warning with -fshort-enums

On targets that have -fshort-enums enabled by default, the type casts
in the pr108251 analyzer tests warn that the byte-aligned enums may
not be sufficiently aligned to be a struct connection *.  The function
can't know better, the warning is reasonable, the code doesn't
expected enums to be shorter and less aligned than the struct.

Rather than use -fno-short-enums, I decided to embrace the warning on
targets that have short_enums enabled by default.

However, C++ doesn't issue the warning, because even with
-fshort-enums, enumeration types are not TYPE_PACKED, and the
expression is not sufficiently simplified by the C++ front-end for
check_and_warn_address_or_pointer_of_packed_member to identify the
insufficiently aligned pointer.  So don't expect the warning there.


for  gcc/testsuite/ChangeLog

	* c-c++-common/analyzer/null-deref-pr108251-smp_fetch_ssl_fc_has_early-O2.c:
	Expect "unaligned pointer value" warning on short_enums
	targets, but not in c++.
	* c-c++-common/analyzer/null-deref-pr108251-smp_fetch_ssl_fc_has_early.c:
	Likewise.

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