updated the build system:

 - new files for the "cygwin" platform
 - new workspace files for Visual C++ in "builds/win32/visualc"
 - updated "docs/BUILD" slightly
diff --git a/INSTALL b/INSTALL
index 72ded27..cc7bcba 100644
--- a/INSTALL
+++ b/INSTALL
@@ -17,7 +17,7 @@
 
     alternatively, you can pass parameters to the configure script
     with the CFG variable, as in:
-  
+
      - make CFG="--prefix=/usr"
      - make