configure.exe: improve error message by adding the filename.

Before:
Could not find output file: No such file or directory

After:
Could not find output file 'arch.exe' or 'arch' in C:/Qt/qt5/qtbase/config.tests/arch : No such file or directory

(it turned out that linking in that directory failed because of a wrong %PATH%)

Change-Id: I948d7f10f7e82f77a08ac9a8db76d97536c42dd0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>