ugh, we have to build unicorn for ubuntu

.github/workflows/test_evm.yml

@@ -13,6 +13,13 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get -y --no-install-recommends install golang-1.16 nodejs npm
+    - name: Install unicorn
+      run: |
+        curl -LO https://github.com/unicorn-engine/unicorn/archive/1.0.3.tar.gz
+        tar xvf 1.0.3.tar.gz
+        cd unicorn-1.0.3
+        UNICORN_ARCHS=mips make -j8
+        sudo UNICORN_ARCHS=mips make install
     - name: Install yarn
       run: |
         npm install --global yarn