Don't use native cpu in cross

Author: calebzulawski

.github/workflows/ci.yml

@@ -186,9 +186,9 @@ jobs:
           # - mips64-unknown-linux-gnuabi64
         target_feature: [default]
         include:
-          - { target: powerpc64-unknown-linux-gnu, target_feature: "native" }
-          - { target: powerpc64le-unknown-linux-gnu, target_feature: "native" }
-          - { target: riscv64gc-unknown-linux-gnu, target_feature: "native" }
+          - { target: powerpc64-unknown-linux-gnu, target_feature: "+vsx" }
+          - { target: powerpc64le-unknown-linux-gnu, target_feature: "+vsx" }
+          - { target: riscv64gc-unknown-linux-gnu, target_feature: "+zvl128b" }
 
     steps:
       - uses: actions/checkout@v2