Remove desugar support

Desugaring is always handled by d8 now.

Test: m checkbuild
Change-Id: I8af88522fb1280854ebb4e4957faf70ab59a74f4
diff --git a/core/config.mk b/core/config.mk
index 6c062a6..0920b56 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -570,9 +570,7 @@
 
 # Work around for b/68406220
 # This should match the soong version.
-ifndef USE_D8
-  USE_D8 := true
-endif
+USE_D8 := true
 
 # Default R8 behavior when USE_R8 is not specified.
 ifndef USE_R8
@@ -586,7 +584,6 @@
   AIDL := $(HOST_OUT_EXECUTABLES)/aidl
   AAPT := $(HOST_OUT_EXECUTABLES)/aapt
   AAPT2 := $(HOST_OUT_EXECUTABLES)/aapt2
-  DESUGAR := $(HOST_OUT_JAVA_LIBRARIES)/desugar.jar
   MAINDEXCLASSES := $(HOST_OUT_EXECUTABLES)/mainDexClasses
   SIGNAPK_JAR := $(HOST_OUT_JAVA_LIBRARIES)/signapk$(COMMON_JAVA_PACKAGE_SUFFIX)
   SIGNAPK_JNI_LIBRARY_PATH := $(HOST_OUT_SHARED_LIBRARIES)
@@ -596,7 +593,6 @@
   AIDL := $(prebuilt_build_tools_bin)/aidl
   AAPT := $(prebuilt_sdk_tools_bin)/aapt
   AAPT2 := $(prebuilt_sdk_tools_bin)/aapt2
-  DESUGAR := $(prebuilt_build_tools_jars)/desugar.jar
   MAINDEXCLASSES := $(prebuilt_sdk_tools)/mainDexClasses
   SIGNAPK_JAR := $(prebuilt_sdk_tools)/lib/signapk$(COMMON_JAVA_PACKAGE_SUFFIX)
   SIGNAPK_JNI_LIBRARY_PATH := $(prebuilt_sdk_tools)/$(HOST_OS)/lib64