Remove legacy clang prebuilts, and update 3.6 to use appropriate groups.

Change-Id: Ie274f4638e6c7727fb235ede57472d22dda3e4a5

default.xml

@@ -429,22 +429,8 @@
   <project path="packages/wallpapers/PhaseBeam" name="platform/packages/wallpapers/PhaseBeam" />
   <project path="pdk" name="platform/pdk" groups="pdk" />
   <project path="prebuilts/android-emulator" name="platform/prebuilts/android-emulator" clone-depth="1" />
-  <project path="prebuilts/clang/darwin-x86/3.1" name="platform/prebuilts/clang/darwin-x86/3.1" groups="pdk,darwin" />
-  <project path="prebuilts/clang/darwin-x86/3.2" name="platform/prebuilts/clang/darwin-x86/3.2" groups="pdk,darwin" />
-  <project path="prebuilts/clang/darwin-x86/arm/3.3" name="platform/prebuilts/clang/darwin-x86/arm/3.3" groups="arm,darwin,pdk-cw-fs" />
-  <project path="prebuilts/clang/darwin-x86/host/3.4" name="platform/prebuilts/clang/darwin-x86/host/3.4" groups="pdk,darwin" />
-  <project path="prebuilts/clang/darwin-x86/host/3.5" name="platform/prebuilts/clang/darwin-x86/host/3.5" groups="pdk,darwin" />
-  <project path="prebuilts/clang/darwin-x86/host/3.6" name="platform/prebuilts/clang/darwin-x86/host/3.6" />
-  <project path="prebuilts/clang/darwin-x86/mips/3.3" name="platform/prebuilts/clang/darwin-x86/mips/3.3" groups="darwin,mips,pdk-cw-fs" />
-  <project path="prebuilts/clang/darwin-x86/x86/3.3" name="platform/prebuilts/clang/darwin-x86/x86/3.3" groups="darwin,pdk-cw-fs,x86" />
-  <project path="prebuilts/clang/linux-x86/3.1" name="platform/prebuilts/clang/linux-x86/3.1" groups="pdk,linux" />
-  <project path="prebuilts/clang/linux-x86/3.2" name="platform/prebuilts/clang/linux-x86/3.2" groups="pdk,linux" />
-  <project path="prebuilts/clang/linux-x86/arm/3.3" name="platform/prebuilts/clang/linux-x86/arm/3.3" groups="arm,linux,pdk-cw-fs" />
-  <project path="prebuilts/clang/linux-x86/host/3.4" name="platform/prebuilts/clang/linux-x86/host/3.4" groups="pdk,linux" />
-  <project path="prebuilts/clang/linux-x86/host/3.5" name="platform/prebuilts/clang/linux-x86/host/3.5" groups="pdk,linux" />
-  <project path="prebuilts/clang/linux-x86/host/3.6" name="platform/prebuilts/clang/linux-x86/host/3.6" />
-  <project path="prebuilts/clang/linux-x86/mips/3.3" name="platform/prebuilts/clang/linux-x86/mips/3.3" groups="linux,mips,pdk-cw-fs" />
-  <project path="prebuilts/clang/linux-x86/x86/3.3" name="platform/prebuilts/clang/linux-x86/x86/3.3" groups="linux,pdk-cw-fs,x86" />
+  <project path="prebuilts/clang/darwin-x86/host/3.6" name="platform/prebuilts/clang/darwin-x86/host/3.6" groups="pdk,darwin" />
+  <project path="prebuilts/clang/linux-x86/host/3.6" name="platform/prebuilts/clang/linux-x86/host/3.6" groups="pdk,linux" />
   <project path="prebuilts/devtools" name="platform/prebuilts/devtools" />
   <project path="prebuilts/eclipse" name="platform/prebuilts/eclipse" groups="pdk" />
   <project path="prebuilts/eclipse-build-deps" name="platform/prebuilts/eclipse-build-deps" groups="notdefault,eclipse" />