build: fix vendor symbols in gdb

Set TARGET_OUT_VENDOR_SHARED_LIBRARIES_UNSTRIPPED
Append '64' for 64-bit libraries

Change-Id: Ief289bb23950d4bed84cf616cff6038fbd8caf95
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 7f77883..bfaac26 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -340,6 +340,7 @@
 TARGET_OUT_UNSTRIPPED := $(PRODUCT_OUT)/symbols
 TARGET_OUT_EXECUTABLES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/bin
 TARGET_OUT_SHARED_LIBRARIES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/lib
+TARGET_OUT_VENDOR_SHARED_LIBRARIES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/$(TARGET_COPY_OUT_VENDOR)/lib
 TARGET_ROOT_OUT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)
 TARGET_ROOT_OUT_SBIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/sbin
 TARGET_ROOT_OUT_BIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/bin