Don't set up platform if dependency is not satisfied.

Author: sunoru

.github/workflows/CI.yml

@@ -40,6 +40,8 @@ jobs:
         with:
           version: ${{ matrix.julia-version }}
           arch: ${{ matrix.julia-arch }}
+      - name: Test loadability
+        run: julia --project=@. -e 'using Pkg;Pkg.instantiate();using Webviews'
       - name: Set up dependency on Linux
         if: matrix.os == 'ubuntu-latest'
         run: sudo apt-get update && sudo apt-get install libwebkit2gtk-4.0-dev

src/Webviews.jl

@@ -97,8 +97,9 @@ end
 
 function __init__()
     download_libwebview()
-    _check_dependency()
-    _setup_platform()
+    if _check_dependency()
+        _setup_platform()
+    end
     nothing
 end