allow verify x86 to fail

Author: gnzlbg

.travis.yml

@@ -41,7 +41,8 @@ matrix:
     - env: DOCUMENTATION
       install: true
       script: ci/dox.sh
-    - script: cargo test --manifest-path crates/stdsimd-verify/Cargo.toml
+    - env: VERIFY_X86
+      script: cargo test --manifest-path crates/stdsimd-verify/Cargo.toml
       install: true
     - env: RUSTFMT=On TARGET=x86_64-unknown-linux-gnu NO_ADD=1
       before_script:
@@ -54,6 +55,7 @@ matrix:
         cargo clippy --all -- -D clippy-pedantic
   allow_failures:
     - env: CLIPPY=On TARGET=x86_64-unknown-linux-gnu NO_ADD=1
+    - env: VERIFY_X86
 
 before_install:
   # FIXME (travis-ci/travis-ci#8920) shouldn't be necessary...