biology/iolib: fix build on armv7
This port tries to use NEON if __ARM_NEON is defined. Unfortunately it
now requires a bunch of intrinsics available on AArch64 only, breaking
the armv7 build. Fix the build by disabling NEON on armv7.
Approved by: portmgr (build fix blanket)
MFH: 2026Q1