Remove gpg workaround from riscv

[am11]

No description provided.

[mthalman]

@am11 - The illumos Dockerfile is failing to build.

#6 1.536 Building binutils. Please wait..
#6 1.540 --2024-07-29 21:29:10--  https://ftp.gnu.org/gnu/binutils/binutils-2.42.tar.xz
#6 1.542 Resolving ftp.gnu.org (ftp.gnu.org)... 209.51.188.20, 2001:470:142:3::b
#6 2.230 Connecting to ftp.gnu.org (ftp.gnu.org)|209.51.188.20|:443... failed: Connection timed out.
#6 137.3 Connecting to ftp.gnu.org (ftp.gnu.org)|2001:470:142:3::b|:443... failed: Network is unreachable.
#6 138.3 xz: (stdin): File format not recognized
#6 138.3 tar: Child returned status 1
#6 138.3 tar: Error is not recoverable: exiting now
#6 ERROR: executor failed running [/bin/sh -c /scripts/eng/common/cross/build-rootfs.sh x64 illumos --skipunmount]: exit code: 2

[am11]

https://gnu.org/ is down right now.