games/CWR-CE: fix build on armv7

• disabled pre-compiled headers to work around a long-standing clang bug
• apply sse2neon workaround to arm, too
• fix assumption of size_t being 64 bits in a hash calculation
• improve architecture name reporting

See also: https://github.com/llvm/llvm-project/issues/69524
Approved by: portmgr (build fix blanket)
MFH: 2026Q3

(cherry picked from commit 319393265d592e3bd5b422959190a12bd4e02033)