configure - fix detection of MSVC compiler in x64

configure - fix detection of MSVC compiler in x64

x86 processes get redirected to the 32 bit area of the registry,
while 64 bit processes access the registry in raw form.
Added the registry paths for 64 bit processes to see the 32 bit
registry keys for MS visual studio. (Wow6432Node)

This problem was revealed when we stopped including configure.exe
as a binary checkin to git. Running configure in an x64 compiler
environment results in creating an x64 configure.exe

Change-Id: I5e3e51ddbf20ccc65abf1833bf23ee5670bd973e
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>