Export SOONG_CC_API_XML to Make outside androidmk

This relands Ie0a945d879de4f99ce76d005aea8041719c244f7 with a fix
to prevent building XMl files for multiple variants of a library.

The SOONG_CC_API_XML values are needed for modules that are not
exported to Make, export them from a singleton that covers all
modules instead of an AndroidMkProvider that may not be called
for some modules.

Bug: 193819970
Test: forrest
Change-Id: I54710c00901976a736e88126f406e02b1f3c3586

cc/library.go

@@ -956,7 +956,7 @@ func (library *libraryDecorator) compile(ctx ModuleContext, flags Flags, deps Pa
 			nativeAbiResult.versionScript)
 
 		// Parse symbol file to get API list for coverage
-		if library.stubsVersion() == "current" && ctx.PrimaryArch() {
+		if library.stubsVersion() == "current" && ctx.PrimaryArch() && !ctx.inRecovery() && !ctx.inProduct() && !ctx.inVendor() {
 			library.apiListCoverageXmlPath = parseSymbolFileForAPICoverage(ctx, symbolFile)
 		}
 
@@ -1035,6 +1035,8 @@ type libraryInterface interface {
 	androidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer)
 
 	availableFor(string) bool
+
+	getAPIListCoverageXMLPath() android.ModuleOutPath
 }
 
 type versionedInterface interface {
@@ -1971,6 +1973,10 @@ func (library *libraryDecorator) makeUninstallable(mod *Module) {
 	mod.ModuleBase.MakeUninstallable()
 }
 
+func (library *libraryDecorator) getAPIListCoverageXMLPath() android.ModuleOutPath {
+	return library.apiListCoverageXmlPath
+}
+
 var versioningMacroNamesListKey = android.NewOnceKey("versioningMacroNamesList")
 
 // versioningMacroNamesList returns a singleton map, where keys are "version macro names",