MSVC: do not use edit-and-continue for Visual C++ builds

It breaks on compiling debug.cc, because LINE is variable

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Created by  Steven Noonan  on October 15, 2009
FBVGNWA6N7447REAWLTTW7JPWXI6ZJZHKM5Y4GRHVSFPVY4Z62HQC
Change contents