Disable all host OS variants except those explicitly included.

Necessary to avoid problems with implicitly enabled host OS'es, e.g.
linux_glibc getting enabled when we only supply a linux_bionic linker
in runtime-module-host-exports. That will then cause a non-functional
prebuilt to take precedence over source if the prebuilt is preferred.

We don't do this for device since we so far only support a single
device OS (android).

This introduces the notion that SDK member types can be host OS
dependent or not. That way java members with host prebuilts don't get
restricted to a specific host OS.

Test: m nothing
Test: build/soong/scripts/build-aml-prebuilts.sh runtime-module-host-exports
  Check that the generated Android.bp correctly disables the bionic
  linker prebuilt for linux_glibc.
Test: art/build/apex/runtests.sh
  on master-art with an updated runtime SDK snapshot
Test: art/tools/buildbot-build.sh {--host,--target}
  on master-art with an updated runtime SDK snapshot
Bug: 160349757
Change-Id: Idad7ef138cdbcbd209d390bf6c10ca8365d4619f

cc/binary_sdk_member.go

@@ -29,7 +29,8 @@ func init() {
 
 var ccBinarySdkMemberType = &binarySdkMemberType{
 	SdkMemberTypeBase: android.SdkMemberTypeBase{
-		PropertyName: "native_binaries",
+		PropertyName:    "native_binaries",
+		HostOsDependent: true,
 	},
 }
 

cc/library_headers.go

@@ -25,8 +25,9 @@ func init() {
 
 var headersLibrarySdkMemberType = &librarySdkMemberType{
 	SdkMemberTypeBase: android.SdkMemberTypeBase{
-		PropertyName: "native_header_libs",
-		SupportsSdk:  true,
+		PropertyName:    "native_header_libs",
+		SupportsSdk:     true,
+		HostOsDependent: true,
 	},
 	prebuiltModuleType: "cc_prebuilt_library_headers",
 	noOutputFiles:      true,

cc/library_sdk_member.go

@@ -27,8 +27,9 @@ import (
 
 var sharedLibrarySdkMemberType = &librarySdkMemberType{
 	SdkMemberTypeBase: android.SdkMemberTypeBase{
-		PropertyName: "native_shared_libs",
-		SupportsSdk:  true,
+		PropertyName:    "native_shared_libs",
+		SupportsSdk:     true,
+		HostOsDependent: true,
 	},
 	prebuiltModuleType: "cc_prebuilt_library_shared",
 	linkTypes:          []string{"shared"},
@@ -36,8 +37,9 @@ var sharedLibrarySdkMemberType = &librarySdkMemberType{
 
 var staticLibrarySdkMemberType = &librarySdkMemberType{
 	SdkMemberTypeBase: android.SdkMemberTypeBase{
-		PropertyName: "native_static_libs",
-		SupportsSdk:  true,
+		PropertyName:    "native_static_libs",
+		SupportsSdk:     true,
+		HostOsDependent: true,
 	},
 	prebuiltModuleType: "cc_prebuilt_library_static",
 	linkTypes:          []string{"static"},
@@ -45,8 +47,9 @@ var staticLibrarySdkMemberType = &librarySdkMemberType{
 
 var staticAndSharedLibrarySdkMemberType = &librarySdkMemberType{
 	SdkMemberTypeBase: android.SdkMemberTypeBase{
-		PropertyName: "native_libs",
-		SupportsSdk:  true,
+		PropertyName:    "native_libs",
+		SupportsSdk:     true,
+		HostOsDependent: true,
 	},
 	prebuiltModuleType: "cc_prebuilt_library",
 	linkTypes:          []string{"static", "shared"},