net/ipxe: Update to latest commit

iPXE naturally doesn't require or link with any of the libraries
provided by GCC, so remove the GCC run dependency. In the absence of
a better solution to do this we use the hack used by other ports like
devel/linux-kernel, sysutils/memtest86+, sysutils/grub2-bhyve,
misc/seabios, ... [1]

Changes: https://github.com/ipxe/ipxe/compare/26050fd4c87c50503d5bd573b2ec91703676e211...1b67a0564657b6fcef18b1588ea6491ca1b1996d
PR: 211154 [1]