Handle already existing targets of different name

In other words, if, in bp2build, module "foo" would generate "foo",
and "foo_two", and "foo_two" already exists in a build file,
bp2build should label "foo" as being unconvertible.

Fixes: 301321658
Fixes: 301312582
Bug: 285631638
Test: Unit tests
Test: Verified that `m bp2build` results in bit-for-bit identical
contents for out/soong/bp2build before and after this change.

Change-Id: Icbbdd69fce83579ec9b172d04b2bf1f294698f70

android/config.go

@@ -2022,10 +2022,9 @@ func (c *config) LogMixedBuild(ctx BaseModuleContext, useBazel bool) {
 	}
 }
 
-func (c *config) HasBazelBuildTargetInSource(ctx BaseModuleContext) bool {
-	moduleName := ctx.Module().Name()
-	for _, buildTarget := range c.bazelTargetsByDir[ctx.ModuleDir()] {
-		if moduleName == buildTarget {
+func (c *config) HasBazelBuildTargetInSource(dir string, target string) bool {
+	for _, existingTarget := range c.bazelTargetsByDir[dir] {
+		if target == existingTarget {
 			return true
 		}
 	}