Fix mac build error with C standard lib macros

This fix errors of that sort:

 moc_PythonQtStdDecorators.cxx:152:25:
error: expected unqualified-id
        case 4: _t->emit((*reinterpret_cast<
QObject*(*)>(_a[1])),(*reinterpret_cast< const

Add fix for mac build error related C standard lib macros to main header

By updating PythonQtPythonIncludes.h which is included in all PythonQt
headers, it is ensured the fix will be applied consistently.

Author: pieper

src/PythonQtInstanceWrapper.h

@@ -45,6 +45,7 @@
 #include "PythonQtPythonInclude.h"
 
 #include "PythonQtSystem.h"
+
 #include <QPointer>
 
 #include "structmember.h"

src/PythonQtPythonInclude.h

@@ -92,4 +92,27 @@
 # include <Python.h>
 #endif
 
+/*
+ * The following undefs for C standard library macros prevent
+ * build errors of the following type on mac ox 10.7.4 and XCode 4.3.3
+ *
+/usr/include/c++/4.2.1/bits/localefwd.h:57:21: error: too many arguments provided to function-like macro invocation
+    isspace(_CharT, const locale&);
+                    ^
+/usr/include/c++/4.2.1/bits/localefwd.h:56:5: error: 'inline' can only appear on functions
+    inline bool
+    ^
+/usr/include/c++/4.2.1/bits/localefwd.h:57:5: error: variable 'isspace' declared as a template
+    isspace(_CharT, const locale&);
+    ^
+*/
+#undef isspace
+#undef isupper
+#undef islower
+#undef isalpha
+#undef isalnum
+#undef toupper
+#undef tolower
+
 #endif
+