Fix tests link error on Windows

This commit fixes a link error building PythonQtCppTests on Windows:

    1>PythonQtCppTests.obj : error LNK2001: unresolved external symbol "int __cdecl tests_PythonQtTestMain(int,char * * const)" (?tests_PythonQtTestMain@@YAHHQEAPEAD@Z)
    1>C:\temp\PythonQt-build\Debug\PythonQtCppTests.exe : fatal error LNK1120: 1 unresolved externals

Author: msmolens

tests/PythonQtTestMain.cpp

@@ -44,7 +44,7 @@
 
 #include <QApplication>
 
-int main( int argc, char **argv )
+int main(int argc, char *argv[])
 {
   QApplication qapp(argc, argv);