sysutils/uefi-edk2-bhyve: Remove GCC run dependency

The firmware does not require or link with any of the libraries
provided by GCC, so remove the GCC run dependency.

Due to the lack of an accepted better solution in bsd.gcc.mk to do
this, we use the hack used by other ports like devel/linux-kernel,
sysutils/memtest86+, sysutils/grub2-bhyve, misc/seabios, net/ipxe, ...

PR: 211079, 211154
Approved by: Process paralysis