Move/dedupe some host path functions in package_ctx.go.

These functions don't need a PackageContext object.

Test: m
Bug: 145934348
Change-Id: Ia1da2c76cbad292f9ca79617199b2b5b6b265568
diff --git a/android/package_ctx.go b/android/package_ctx.go
index cf8face..d3527fa 100644
--- a/android/package_ctx.go
+++ b/android/package_ctx.go
@@ -16,7 +16,6 @@
 
 import (
 	"fmt"
-	"runtime"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -177,46 +176,30 @@
 // package-scoped variable's initialization.
 func (p PackageContext) HostBinToolVariable(name, path string) blueprint.Variable {
 	return p.VariableFunc(name, func(ctx PackageVarContext) string {
-		return p.HostBinToolPath(ctx, path).String()
+		return ctx.Config().HostToolPath(ctx, path).String()
 	})
 }
 
-func (p PackageContext) HostBinToolPath(ctx PackageVarContext, path string) Path {
-	return PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "bin", path)
-}
-
 // HostJNIToolVariable returns a Variable whose value is the path to a host tool
 // in the lib directory for host targets. It may only be called during a Go
 // package's initialization - either from the init() function or as part of a
 // package-scoped variable's initialization.
 func (p PackageContext) HostJNIToolVariable(name, path string) blueprint.Variable {
 	return p.VariableFunc(name, func(ctx PackageVarContext) string {
-		return p.HostJNIToolPath(ctx, path).String()
+		return ctx.Config().HostJNIToolPath(ctx, path).String()
 	})
 }
 
-func (p PackageContext) HostJNIToolPath(ctx PackageVarContext, path string) Path {
-	ext := ".so"
-	if runtime.GOOS == "darwin" {
-		ext = ".dylib"
-	}
-	return PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "lib64", path+ext)
-}
-
 // HostJavaToolVariable returns a Variable whose value is the path to a host
 // tool in the frameworks directory for host targets. It may only be called
 // during a Go package's initialization - either from the init() function or as
 // part of a package-scoped variable's initialization.
 func (p PackageContext) HostJavaToolVariable(name, path string) blueprint.Variable {
 	return p.VariableFunc(name, func(ctx PackageVarContext) string {
-		return p.HostJavaToolPath(ctx, path).String()
+		return ctx.Config().HostJavaToolPath(ctx, path).String()
 	})
 }
 
-func (p PackageContext) HostJavaToolPath(ctx PackageVarContext, path string) Path {
-	return PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "framework", path)
-}
-
 // IntermediatesPathVariable returns a Variable whose value is the intermediate
 // directory appended with the supplied path. It may only be called during a Go
 // package's initialization - either from the init() function or as part of a