Add DistPath to reference the dist folder

Instead of open-coding the logic of whether there is one, or where to
find it.

Bug: 76168832
Test: diff out/soong/build.ninja without dist
Test: diff out/soong/build.ninja with dist specified
Change-Id: Ia3f1ef335e2d6e2175343338d04867d778a50300
Merged-In: Ia3f1ef335e2d6e2175343338d04867d778a50300
(cherry picked from commit bc0c5092671cbe7e58ab6a1f886414f864af3024)
diff --git a/cc/builder.go b/cc/builder.go
index d438add..73a9168 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -199,11 +199,10 @@
 		func(ctx android.PackageRuleContext) blueprint.RuleParams {
 
 			commandStr := "($sAbiDiffer $allowFlags -lib $libName -arch $arch -check-all-apis -o ${out} -new $in -old $referenceDump)"
-			distDir := ctx.Config().ProductVariables.DistDir
-			commandStr += " || (echo ' ---- Please update abi references by running platform/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l ${libName} ----'"
-			if distDir != nil && *distDir != "" {
-				distAbiDiffDir := *distDir + "/abidiffs/"
-				commandStr += " && (mkdir -p " + distAbiDiffDir + " && cp ${out} " + distAbiDiffDir + ")"
+			distAbiDiffDir := android.PathForDist(ctx, "abidiffs")
+			commandStr += "|| (echo ' ---- Please update abi references by running platform/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l ${libName} ----'"
+			if distAbiDiffDir.Valid() {
+				commandStr += " && (mkdir -p " + distAbiDiffDir.String() + " && cp ${out} " + distAbiDiffDir.String() + ")"
 			}
 			commandStr += " && exit 1)"
 			return blueprint.RuleParams{