sysutils/edk2: Fix build on aarch64

Build on aarch64 was failing with the following error:

ld-elf.so.1: /lib/libgcc_s.so.1: version GCC_4.5.0 required by
/usr/local/lib/gcc11/libstdc++.so.6 not found

Fix by using /usr/local/lib/gcc*/libgcc_s.so.1 instead.

While here, also define WWW variable.

PR: 266404
Approved by: imp (uboot)