TUN-5549: Revert "TUN-5277: Ensure cloudflared binary is FIPS compliant on linux amd64"

This reverts commit 157f5d1412.

FIPS compliant binaries (for linux/amd64) are causing HTTPS origins to not
be reachable by cloudflared in certain cases (e.g. with Let's Encrypt certificates).

Origins that are not HTTPS for cloudflared are not affected.

cfsetup.yaml

@@ -1,5 +1,5 @@
 pinned_go: &pinned_go go=1.17-1
-pinned_go_fips: &pinned_go_fips go-boring=1.16.6-7
+pinned_go_fips: &pinned_go_fips go-boring=1.16.6-6
 
 build_dir: &build_dir /cfsetup_build
 default-flavor: buster
@@ -41,6 +41,7 @@ stretch: &stretch
       - wget https://github.com/sudarshan-reddy/msitools/releases/download/v0.101b/wixl -P /usr/local/bin
       - chmod a+x /usr/local/bin/wixl
     post-cache:
+      - export FIPS=true
       - ./build-packages.sh
   github-release-pkgs:
     build_dir: *build_dir