test/pkg: restrict code-coverage to unix_only

Author: timholy

test/pkg.jl

@@ -78,6 +78,7 @@ temp_pkg_dir() do
 end
 
 # Testing with code-coverage
+@unix_only begin                 # TODO: delete unix_only when #8911, #9654 are fixed
 temp_pkg_dir() do
   Pkg.generate("PackageWithCodeCoverage", "MIT", config=Dict("user.name"=>"Julia Test", "user.email"=>"[email protected]"))
 
@@ -118,3 +119,4 @@ end"""
       @test covlines[i] == covline
   end
 end
+end