Log Message:
math/py-scipy: Fix dependency versions.

1. Upstream is very clear about requiring only gcc>=9.1 in their
   extensive documentation on toolchain dependencies in
   doc/source/dev/toolchain.rst.  I successfully built this on
   netbsd-9 with gcc10.  Evidently gcc>=14 is not required.

2. Upstream formally declares it needs meson>=1.5.0, causing
   configure to immediately fail with older meson, so reflect that in
   our TOOL_DEPENDS.

   (The comment over TOOL_DEPENDS on meson seems to be obsolete now,
   so I removed it, but feel free to put it back if I misunderstood.)