Don't write transitive dependencies to Android-${TARGET_PRODUCT}.mk

Java libraries were writing lists of files that changed whenever
transitive dependencies changed to Android-${TARGET_PRODUCT}.mk, causing
Kati analysis to rerun whenever a dependency was changed in Soong.
In both cases, Make would immediately use the list to write a single
output file.  Write the files in Soong and pass the path to the file
to Make instead, which will both reduce the size of
Android-${TARGET_PRODUCT}.mk and skip Kati analysis more often.

Bug: 309006256
Test: m checkbuild
Change-Id: I5dff16c6fb7cca8c6da927b37c612c7b1d0954e6

java/builder.go

@@ -264,6 +264,16 @@ var (
 			Command:     `${config.Zip2ZipCmd} -i ${in} -o ${out} -x 'META-INF/services/**/*'`,
 			CommandDeps: []string{"${config.Zip2ZipCmd}"},
 		})
+
+	writeCombinedProguardFlagsFileRule = pctx.AndroidStaticRule("writeCombinedProguardFlagsFileRule",
+		blueprint.RuleParams{
+			Command: `rm -f $out && ` +
+				`for f in $in; do ` +
+				` echo  && ` +
+				` echo "# including $$f" && ` +
+				` cat $$f; ` +
+				`done > $out`,
+		})
 )
 
 func init() {
@@ -686,6 +696,15 @@ func TransformZipAlign(ctx android.ModuleContext, outputFile android.WritablePat
 	})
 }
 
+func writeCombinedProguardFlagsFile(ctx android.ModuleContext, outputFile android.WritablePath, files android.Paths) {
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        writeCombinedProguardFlagsFileRule,
+		Description: "write combined proguard flags file",
+		Inputs:      files,
+		Output:      outputFile,
+	})
+}
+
 type classpath android.Paths
 
 func (x *classpath) formJoinedClassPath(optName string, sep string) string {