Add details how to build for DOS to README

Update README to list all the needed rpm files for DOS cross-compilation
and update the download location of cwsdpmi.

Corresponding to flashrom svn r1186.
Signed-off-by: Idwer Vollering <vidwer+flashrom@gmail.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

README

@@ -94,8 +94,8 @@ To cross-compile on Linux for DOS:
 
  Get RPMs of the cross compiler from the DJGPP site and install them:
  djcross-binutils-2.19.1-10ap.i386.rpm
- djcross-gcc-tools-4.4.1-1ap.i686.rpm
  djcross-gcc-4.3.2-8ap.i686.rpm
+ djcrx-2.04pre_20090725-13ap.i386.rpm
  Download pciutils 3.1.5 and apply http://assembler.cz/flashrom/pciutils.patch
  Download and compile http://assembler.cz/flashrom/libgetopt/
  Compile pciutils, see README.DJGPP for instructions.
@@ -107,8 +107,9 @@ To cross-compile on Linux for DOS:
  or (above settings hardcoded)
  make djgpp-dos
  You might have to add WARNERROR=no to the make command line.
- To run flashrom.exe, download http://clio.rice.edu/djgpp/csdpmi7b.zip and
- make sure CWSDPMI.EXE is in the current directory.
+ To run flashrom.exe, download and unpack
+ http://homer.rice.edu/~sandmann/cwsdpmi/csdpmi7b.zip and make sure
+ CWSDPMI.EXE is in the current directory.
 
 Installation
 ------------