refactor to README.md

README.md

@@ -14,11 +14,9 @@ install path, and that the riscv-gnu-toolchain package is installed.
 
     $ git clone https://github.com/riscv/riscv-tests
     $ cd riscv-tests
-    $ git submodule update --init --recursive
     $ autoconf
-    $ ./configure --prefix=$RISCV/target
+    $ ./configure
     $ make
-    $ make install
 
 The rest of this document describes the format of test programs for the RISC-V
 architecture.