THRIFT-2571 Simplify cross compilation using CMake

fix CMake build and update README.md
diff --git a/compiler/cpp/README.md b/compiler/cpp/README.md
index 3c40809..017617f 100644
--- a/compiler/cpp/README.md
+++ b/compiler/cpp/README.md
@@ -17,14 +17,9 @@
 Now open the folder build_ec using eclipse.
 
 
-### Cross compile using mingw32
+### Cross compile using mingw32 and generate a Windows Installer with CPack
 
     mkdir build_mingw32 && cd build_mingw32
-    cmake -DCMAKE_TOOLCHAIN_FILE=../../../contrib/mingw32-toolchain.cmake ..
-    make
-
-### Generate a Windows Installer Package of the Apache Thrift Compiler
-
     cmake -DCMAKE_TOOLCHAIN_FILE=../../../contrib/mingw32-toolchain.cmake -DTHRIFT_COMPILER_HS=OFF ..
     cpack