krb5 commit: Mention Visual Studio 2010 SP1 in windows README

[Benjamin Kaduk]

https://github.com/krb5/krb5/commit/025008dd215c20f804823dafa3bd9f45135be53e
commit 025008dd215c20f804823dafa3bd9f45135be53e
Author: Ben Kaduk <kaduk at mit.edu>
Date:   Thu Mar 19 14:14:02 2015 -0400

    Mention Visual Studio 2010 SP1 in windows README
    
    The service pack is needed to avoid a linker error due to an
    issue with the cvtres.exe utility, which manifests as
    LINK: fatal error LNK1123: failure during conversion to COFF: file
    invalid or corrupt.

 src/windows/README |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/windows/README b/src/windows/README
index 363a6cb..c622c86 100644
--- a/src/windows/README
+++ b/src/windows/README
@@ -7,7 +7,7 @@ not present in the Unix krb5 distribution, most notably the
 MIT Kerberos Ticket Manager application.
 
 To build Kerberos 5 on Windows, you will need the Windows SDK (XP SP3
-or later), VisualStudio (2010 Professional), a version of Perl, and some
+or later), VisualStudio (2010 Professional SP1), a version of Perl, and some
 common Unix utilities such as sed/awk/cp/cat installed in the
 command-line path.  To build an MSI installer, you will additionally
 need the Windows Installer XML (WiX) toolkit, and to ensure that