Fix the config.tests to correctly detect the 3rd party libraries

When building with Visual C++ it would not detect the 3rd party
libraries because it does not include the lib prefix. So this now
accounts for this. Additionally console is added to the CONFIG line so
there is no need for a WinMain() function.

Change-Id: I5be0114ef609e19ce1da612cac7781aaf748f552
Reviewed-by: aavit <eirik.aavitsland@digia.com>

config.tests/libmng/libmng.pro

 SOURCES = libmng.cpp
 CONFIG -= qt dylib
 mac:CONFIG -= app_bundle
-LIBS += -lmng
+win32:CONFIG += console
+unix|win32-g++*: LIBS += -lmng
+else:win32: LIBS += libmng.lib

config.tests/libtiff/libtiff.pro

 SOURCES = libtiff.cpp
 CONFIG -= qt dylib
 mac:CONFIG -= app_bundle
-LIBS += -ltiff
+win32:CONFIG += console
+unix|win32-g++*: LIBS += -ltiff
+else:win32: LIBS += libtiff.lib