Minor change for symmetry with PyXML: PyDoc_STR should not include

the "safety" parentheses since some older compilers refuse to compile
the module then, claiming that static initializers are non-constant.

This doesn't actually make any difference for Python, since these
definitions are not used when compiling with a version of Python that
already defines the PyDoc_* macros.

Modules/pyexpat.c

@@ -6,7 +6,7 @@
 #include "expat.h"
 
 #ifndef PyDoc_STRVAR
-#define PyDoc_STR(str)         (str)
+#define PyDoc_STR(str)         str
 #define PyDoc_VAR(name)        static char name[]
 #define PyDoc_STRVAR(name,str) PyDoc_VAR(name) = PyDoc_STR(str)
 #endif