Show the "platform tools" version in adb/fastboot --version.

Annoyingly folks parse the "adb --version" output so we have the
less-interesting protocol version first. But at least now we'll
have the "real" version somewhere...

Bug: N/A
Test: "adb --version"/"fastboot --version"
Change-Id: Ia85b561bd8d84c6fd6995923730d36f53b2f800b
diff --git a/adb/Android.mk b/adb/Android.mk
index efdff5d..ca337ee 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -5,6 +5,8 @@
 
 LOCAL_PATH:= $(call my-dir)
 
+include $(LOCAL_PATH)/../platform_tools_tool_version.mk
+
 adb_host_sanitize :=
 adb_target_sanitize :=
 
@@ -13,7 +15,7 @@
     -Wno-unused-parameter \
     -Wno-missing-field-initializers \
     -Wvla \
-    -DADB_REVISION=\"$(BUILD_NUMBER_FROM_FILE)\" \
+    -DADB_VERSION=\"$(tool_version)\" \
 
 ADB_COMMON_posix_CFLAGS := \
     -Wexit-time-destructors \