Package breakpad symbols in target files zip

When BREAKPAD_GENERATE_SYMBOLS is set to true, package the breakpad
symbols into the target files zip thats generated with `make dist`.

Bug: 24165970
Change-Id: I11c0d9a9d9e159475bfdb7bc338f9e9ac60aeada
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 51a2fb3..2899d80 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -384,6 +384,8 @@
 $(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_ODM_SHARED_LIBRARIES := $(TARGET_OUT_ODM)/lib
 $(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_ODM_APPS := $(TARGET_OUT_ODM_APPS)
 
+TARGET_OUT_BREAKPAD := $(PRODUCT_OUT)/breakpad
+
 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