Make kMajorVersion and kMinorVersion take version from version macros

Makefile

@@ -147,7 +147,7 @@ SHARED3 = $(SHARED1)
 SHARED = $(SHARED1)
 else
 # Update db.h if you change these.
-SHARED_MAJOR = 2
+SHARED_MAJOR = 3
 SHARED_MINOR = 0
 SHARED1 = ${LIBNAME}.$(PLATFORM_SHARED_EXT)
 SHARED2 = $(SHARED1).$(SHARED_MAJOR)

README.fb

-* Detailed instructions on how to compile using fbcode and jemalloc
-
-* Latest release is 2.7.fb

include/rocksdb/db.h

@@ -41,9 +41,8 @@ struct ColumnFamilyDescriptor {
       : name(_name), options(_options) {}
 };
 
-// Update Makefile if you change these
-static const int kMajorVersion = 3;
-static const int kMinorVersion = 0;
+static const int kMajorVersion = __ROCKSDB_MAJOR__;
+static const int kMinorVersion = __ROCKSDB_MINOR__;
 
 struct Options;
 struct ReadOptions;

include/rocksdb/version.h

 #pragma once
 
+// Also update Makefile if you change these
 #define __ROCKSDB_MAJOR__ 3
 #define __ROCKSDB_MINOR__ 0
 #define __ROCKSDB_PATCH__ 0