Give slightly less useless versions to adb and fastboot.

This will let us see (a) whether the user has a legit build or something they
built themselves and (b) what Android release it corresponds to.

This isn't as useful as showing what Platform Tools release we correspond to,
but I'm planning on doing that as a separate line.

Bug: N/A
Test: adb --version ; fastboot --version
Change-Id: Idca489295e3c6f8571146f95822c08808e36b382

adb/Android.mk

@@ -8,14 +8,12 @@ LOCAL_PATH:= $(call my-dir)
 adb_host_sanitize :=
 adb_target_sanitize :=
 
-adb_version := $(shell git -C $(LOCAL_PATH) rev-parse --short=12 HEAD 2>/dev/null)-android
-
 ADB_COMMON_CFLAGS := \
     -Wall -Wextra -Werror \
     -Wno-unused-parameter \
     -Wno-missing-field-initializers \
     -Wvla \
-    -DADB_REVISION='"$(adb_version)"' \
+    -DADB_REVISION=\"$(BUILD_NUMBER_FROM_FILE)\" \
 
 ADB_COMMON_posix_CFLAGS := \
     -Wexit-time-destructors \

fastboot/Android.mk

@@ -14,8 +14,6 @@
 
 LOCAL_PATH:= $(call my-dir)
 
-fastboot_version := $(shell git -C $(LOCAL_PATH) rev-parse --short=12 HEAD 2>/dev/null)-android
-
 include $(CLEAR_VARS)
 
 LOCAL_C_INCLUDES := \
@@ -39,7 +37,7 @@ LOCAL_MODULE_TAGS := debug
 LOCAL_MODULE_HOST_OS := darwin linux windows
 LOCAL_CFLAGS += -Wall -Wextra -Werror -Wunreachable-code
 
-LOCAL_CFLAGS += -DFASTBOOT_REVISION='"$(fastboot_version)"'
+LOCAL_CFLAGS += -DFASTBOOT_REVISION=\"$(BUILD_NUMBER_FROM_FILE)\"
 
 LOCAL_SRC_FILES_linux := usb_linux.cpp
 LOCAL_STATIC_LIBRARIES_linux := libselinux