revert back to separate simdjson checkout for older OS images

Change-Id: I3fcee2059a8486e092308e4d53ca398b165dbeae

Author: rdementi

.github/workflows/ci-gcc48.yml

@@ -14,8 +14,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: install simdjson
+      uses: actions/checkout@v2
       with:
-        submodules: recursive
+        repository: simdjson/simdjson
+        path: src/simdjson
     - name: Configure CMake
       run: |
         cmake --version

.github/workflows/ci-gcc5.yml

@@ -14,8 +14,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: install simdjson
+      uses: actions/checkout@v2
       with:
-        submodules: recursive
+        repository: simdjson/simdjson
+        path: src/simdjson
     - name: Configure CMake
       run: |
         cmake --version

.github/workflows/ci-gcc7.yml

@@ -14,8 +14,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: install simdjson
+      uses: actions/checkout@v2
       with:
-        submodules: recursive
+        repository: simdjson/simdjson
+        path: src/simdjson
     - name: Configure CMake
       run: |
         cmake --version