simplify our build instructions to just "make"

thanks to Christian Doczkal <doczkal@ps.uni-saarland.de> for the Makefile snippet!

.gitignore

@@ -8,4 +8,4 @@
 *~
 *.bak
 .coq-native/
-Makefile
+Makefile.coq

Makefile

+# Makefile originally by Christian Doczkal <doczkal@ps.uni-saarland.de>
+all: Makefile.coq
+	+make -f Makefile.coq all
+
+clean: Makefile.coq
+	+make -f Makefile.coq clean
+	rm -f Makefile.coq
+
+Makefile.coq: _CoqProject
+	coq_makefile -f _CoqProject -o Makefile.coq
+
+.PHONY: all clean

README

@@ -15,7 +15,6 @@ fixed version of Ssreflect.
 BUILDING INSTRUCTIONS
 ---------------------
 
-Run the following commands to build the full development:
+Run the following command to build the full development:
 
-  ./configure
   make

configure

-#!/bin/sh
-coq_makefile -f _CoqProject -o Makefile