www/deno: attempt to fix the build on armv7

The v8 build system tries to pass --target=arm-linux-gnueabihf to
LLVM when building on ARM.  We are not Linux, so this confuses clang
to the point where it no longer finds basic include files.  Remove
that option to fix the build.  Some other ports were already patched
the same way.

With this roadblock out of the way, the port now fails as follows:

  In file included from
../../../deno-2.2.9/cargo-crates/v8-135.1.0/src/binding.cc:9:
 
../../../deno-2.2.9/cargo-crates/v8-135.1.0/v8/include/cppgc/allocation.h:175:9:
error: static assertion failed due to requirement 'kWantedAlignment <=
internal::api_constants::kMaxSupportedAlignment': Requested alignment larger
than alignof(std::max_align_t) bytes. Please file a bug to possibly get this
restriction lifted.
    175 |         kWantedAlignment <=
internal::api_constants::kMaxSupportedAlignment,
        |        
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Approved by:	portmgr (build fix blanket)
MFH:		2025Q3

(cherry picked from commit 9eaaf580d94635ab60ee0c0d93da60ddb76cddd0)