www/qt6-webengine: fix build on armv7

Known node issue that has already been fixed before.

Obtained from: www/node20/files/patch-deps_v8_src_codegen_arm_cpu-arm.c
Approved by: portmgr (build fix blanket)
MFH: 2025Q3

(cherry picked from commit c210e668c1a99f97016a635f2584f9521749e848)