Fix pattern rules for $(installed_odex) for libdvm.

When the VM is libdvm, we don't put the odex files in an arch specific
subdirectory. The previous pattern rules don't work because of the extra
"/". With this change, % evaluates to empty string when it's built for
libdvm; % evaluates to "<arch_name>/" when it's built for libart.
Also removed use of $(create-empty-package), which may causes file name
(dummy) conflict with the rule of package.apk.

Bug: 15311527

(cherry picked from commit 994c226b91d0b9695cfde8dabb8f243e9f53be64)

Change-Id: I5469ef1994f2ba91a9c25126349156752fc35b4b
diff --git a/core/dex_preopt_odex_install.mk b/core/dex_preopt_odex_install.mk
index 33f44f0..caaa16d 100644
--- a/core/dex_preopt_odex_install.mk
+++ b/core/dex_preopt_odex_install.mk
@@ -123,8 +123,8 @@
 ifdef built_odex
 # Use pattern rule - we may have multiple installed odex files.
 # Ugly syntax - See the definition get-odex-file-path.
-$(installed_odex) : $(dir $(LOCAL_INSTALLED_MODULE))%/$(notdir $(word 1,$(installed_odex))) \
-                  : $(dir $(LOCAL_BUILT_MODULE))%/$(notdir $(word 1,$(built_odex))) \
+$(installed_odex) : $(dir $(LOCAL_INSTALLED_MODULE))%$(notdir $(word 1,$(installed_odex))) \
+                  : $(dir $(LOCAL_BUILT_MODULE))%$(notdir $(word 1,$(built_odex))) \
     | $(ACP)
 	@echo "Install: $@"
 	$(copy-file-to-target)
diff --git a/core/package_internal.mk b/core/package_internal.mk
index c8d9196..d2681e5 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -385,7 +385,7 @@
 ifdef LOCAL_DEX_PREOPT
 $(built_odex): PRIVATE_DEX_FILE := $(built_dex)
 $(built_odex) : $(built_dex)
-	$(create-empty-package)
+	$(hide) mkdir -p $(dir $@) && rm -f $@
 	$(add-dex-to-package)
 	$(hide) mv $@ $@.input
 	$(call dexpreopt-one-file,$@.input,$@)