build: disable linux_ppc64le target for now

build fails on default 'github_actions' provider's native builder with:

> error: failed to run custom build command for `aws-lc-sys v0.33.0`

Author: salim-b

conda-forge.yml

@@ -9,5 +9,4 @@ github:
   tooling_branch_name: main
 provider:
   linux_aarch64: default
-  linux_ppc64le: default
   osx_arm64: default