Add back make depednency and msvc instructions

Author: keeperofdakeys

README.md

@@ -18,6 +18,7 @@ Read ["Installing Rust"] from [The Book].
 
    * `g++` 4.7 or later or `clang++` 3.x
    * `python` 2.7 (but not 3.x)
+   * GNU `make` 3.81 or later
    * `cmake` 3.4.3 or later
    * `curl`
    * `git`
@@ -112,6 +113,12 @@ With these dependencies installed, you can build the compiler with:
 > python x.py build
 ```
 
+If you're running inside of an msys shell, however, you can run:
+
+```sh
+$ ./x.py build --build=x86_64-pc-windows-msvc && ./x.py dist
+```
+
 Currently building Rust only works with some known versions of Visual Studio. If
 you have a more recent version installed the build system doesn't understand
 then you may need to force rustbuild to use an older version. This can be done