install *.so in different paths for their types

Shared libraries are now installed to different directories depending on
their types.

* NDK libraries: /system/lib/ndk
* VNDK libraries: /system/lib/vndk
* VNDK-ext libraries: /system/lib/vndk-ext
* Framework-only libraries: /system/lib
* Vendor-only libraries: /vendor/lib
* Same-process HALs: /vendor/lib/sameprocess

In addition, a new module type vndk_ext_library is added. It is almost
identical to cc_shared_library but it introduces another attribute
'extends'. This is use to reference the vndk library that this vndk-ext
library is extending.

For example, in order to extend a vndk library libFoo:

cc_library {
  name: "libFoo",
  srcs: [...]
}
---------------------
vndk_ext_library {
  name: "libFoo-extended",
  srcs: [...]
  extends: "libFoo"
}

Then, libFoo will be installed as /system/lib/vndk/libFoo.so and
libFoo-extended will be installed as /system/lib/vndk-ext/libFoo.so.
Note that file name of the latter is libFoo.so, not libFoo-extended.so:
file name of an extending module is automatically set to that of the
extended module.

Bug: 33681361
Test: build & run. Libraries must be in the correct directories.
Change-Id: Ia1eb3940605d582a252c78da0f3a5b36fdab062b

cc/library.go

@@ -587,6 +587,26 @@ func (library *libraryDecorator) toc() android.OptionalPath {
 
 func (library *libraryDecorator) install(ctx ModuleContext, file android.Path) {
 	if !ctx.static() {
+		if ctx.Device() {
+			if ctx.isNdk() {
+				library.baseInstaller.subDir = "ndk"
+				if ctx.Proprietary() {
+					ctx.ModuleErrorf("NDK library must not be proprietary")
+				}
+			} else if ctx.isVndk() {
+				library.baseInstaller.subDir = "vndk"
+				if ctx.Proprietary() {
+					ctx.ModuleErrorf("VNDK library must not be proprietary")
+				}
+			} else if ctx.isSameProcessHal() {
+				library.baseInstaller.subDir = "sameprocess"
+				if !ctx.Proprietary() {
+					ctx.ModuleErrorf("SameProcess HAL library must be proprietary")
+				}
+			} else {
+				// Do nothing for other types of lib
+			}
+		}
 		library.baseInstaller.install(ctx, file)
 	}
 }