Fix `go vet` issues

Test: go vet ./...
Change-Id: Ifb936ccc5e2b5a2c3fcbbbcb54f680e2973ea1b3
diff --git a/cc/cc.go b/cc/cc.go
index 89d45a9..f8a8225 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -991,33 +991,41 @@
 		actx.AddVariationDependencies(nil, depTag, lib)
 	}
 
-	actx.AddVariationDependencies([]blueprint.Variation{{"link", "static"}}, wholeStaticDepTag,
-		deps.WholeStaticLibs...)
+	actx.AddVariationDependencies([]blueprint.Variation{
+		{Mutator: "link", Variation: "static"},
+	}, wholeStaticDepTag, deps.WholeStaticLibs...)
 
 	for _, lib := range deps.StaticLibs {
 		depTag := staticDepTag
 		if inList(lib, deps.ReexportStaticLibHeaders) {
 			depTag = staticExportDepTag
 		}
-		actx.AddVariationDependencies([]blueprint.Variation{{"link", "static"}}, depTag, lib)
+		actx.AddVariationDependencies([]blueprint.Variation{
+			{Mutator: "link", Variation: "static"},
+		}, depTag, lib)
 	}
 
-	actx.AddVariationDependencies([]blueprint.Variation{{"link", "static"}}, lateStaticDepTag,
-		deps.LateStaticLibs...)
+	actx.AddVariationDependencies([]blueprint.Variation{
+		{Mutator: "link", Variation: "static"},
+	}, lateStaticDepTag, deps.LateStaticLibs...)
 
 	for _, lib := range deps.SharedLibs {
 		depTag := sharedDepTag
 		if inList(lib, deps.ReexportSharedLibHeaders) {
 			depTag = sharedExportDepTag
 		}
-		actx.AddVariationDependencies([]blueprint.Variation{{"link", "shared"}}, depTag, lib)
+		actx.AddVariationDependencies([]blueprint.Variation{
+			{Mutator: "link", Variation: "shared"},
+		}, depTag, lib)
 	}
 
-	actx.AddVariationDependencies([]blueprint.Variation{{"link", "shared"}}, lateSharedDepTag,
-		deps.LateSharedLibs...)
+	actx.AddVariationDependencies([]blueprint.Variation{
+		{Mutator: "link", Variation: "shared"},
+	}, lateSharedDepTag, deps.LateSharedLibs...)
 
-	actx.AddVariationDependencies([]blueprint.Variation{{"link", "shared"}}, runtimeDepTag,
-		deps.RuntimeLibs...)
+	actx.AddVariationDependencies([]blueprint.Variation{
+		{Mutator: "link", Variation: "shared"},
+	}, runtimeDepTag, deps.RuntimeLibs...)
 
 	actx.AddDependency(c, genSourceDepTag, deps.GeneratedSources...)
 
@@ -1043,9 +1051,13 @@
 
 	version := ctx.sdkVersion()
 	actx.AddVariationDependencies([]blueprint.Variation{
-		{"ndk_api", version}, {"link", "shared"}}, ndkStubDepTag, variantNdkLibs...)
+		{Mutator: "ndk_api", Variation: version},
+		{Mutator: "link", Variation: "shared"},
+	}, ndkStubDepTag, variantNdkLibs...)
 	actx.AddVariationDependencies([]blueprint.Variation{
-		{"ndk_api", version}, {"link", "shared"}}, ndkLateStubDepTag, variantLateNdkLibs...)
+		{Mutator: "ndk_api", Variation: version},
+		{Mutator: "link", Variation: "shared"},
+	}, ndkLateStubDepTag, variantLateNdkLibs...)
 
 	if vndkdep := c.vndkdep; vndkdep != nil {
 		if vndkdep.isVndkExt() {
@@ -1054,8 +1066,9 @@
 				baseModuleMode = coreMode
 			}
 			actx.AddVariationDependencies([]blueprint.Variation{
-				{"image", baseModuleMode}, {"link", "shared"}}, vndkExtDepTag,
-				vndkdep.getVndkExtendsModuleName())
+				{Mutator: "image", Variation: baseModuleMode},
+				{Mutator: "link", Variation: "shared"},
+			}, vndkExtDepTag, vndkdep.getVndkExtendsModuleName())
 		}
 	}
 }