Some help for SF 614770: MSVC 7.0 compiler support

This changes sys.version under Microsoft builds to include the MS compiler
version number (_MSC_VER).  Since VC 6 and VC 7 are apparently
incompatible, and both can be installed on a single box, distutils needs
some way to figure out which version of MSVC a given Python was compiled
under.

As also suggested by MvL, got rid of #ifdef'ery for the defunct _M_ALPHA
target.

Bugfix candidate?  Hard to say.  As far as I'm concerned, VC 7 wasn't
a supported platform in the 2.2 line.  If somebody thinks it should be,
they can do the work.

PC/pyconfig.h

@@ -61,6 +61,28 @@ MS_CORE_DLL.
 /* Microsoft C defines _MSC_VER */
 #ifdef _MSC_VER
 
+/* We want COMPILER to expand to a string containing _MSC_VER's *value*.
+ * This is horridly tricky, because the stringization operator only works
+ * on macro arguments, and doesn't evaluate macros passed *as* arguments.
+ * Attempts simpler than the following appear doomed to produce "_MSC_VER"
+ * literally in the string.
+ */
+#define _Py_PASTE_VERSION(SUFFIX) \
+	("[MSC v." _Py_STRINGIZE(_MSC_VER) " " SUFFIX "]")
+/* e.g., this produces, after compile-time string catenation,
+ * 	("[MSC v.1200 32 bit (Intel)]")
+ *
+ * _Py_STRINGIZE(_MSC_VER) expands to
+ * _Py_STRINGIZE1((_MSC_VER)) expands to
+ * _Py_STRINGIZE2(_MSC_VER) but as this call is the result of token-pasting
+ *      it's scanned again for macros and so further expands to (under MSVC 6)
+ * _Py_STRINGIZE2(1200) which then expands to
+ * "1200"
+ */
+#define _Py_STRINGIZE(X) _Py_STRINGIZE1((X))
+#define _Py_STRINGIZE1(X) _Py_STRINGIZE2 ## X
+#define _Py_STRINGIZE2(X) #X
+
 /* MSVC defines _WINxx to differentiate the windows platform types
 
    Note that for compatibility reasons _WIN32 is defined on Win32
@@ -76,21 +98,17 @@ MS_CORE_DLL.
 /* set the COMPILER */
 #ifdef MS_WIN64
 #ifdef _M_IX86
-#define COMPILER "[MSC 64 bit (Intel)]"
-#elif defined(_M_ALPHA)
-#define COMPILER "[MSC 64 bit (Alpha)]"
+#define COMPILER _Py_PASTE_VERSION("64 bit (Intel)"
 #else
-#define COMPILER "[MSC 64 bit (Unknown)]"
+#define COMPILER _Py_PASTE_VERSION("64 bit (Unknown)")
 #endif
 #endif /* MS_WIN64 */
 
 #if defined(MS_WIN32) && !defined(MS_WIN64)
 #ifdef _M_IX86
-#define COMPILER "[MSC 32 bit (Intel)]"
-#elif defined(_M_ALPHA)
-#define COMPILER "[MSC 32 bit (Alpha)]"
+#define COMPILER _Py_PASTE_VERSION("32 bit (Intel)")
 #else
-#define COMPILER "[MSC (Unknown)]"
+#define COMPILER _Py_PASTE_VERSION("32 bit (Unknown)")
 #endif
 #endif /* MS_WIN32 && !MS_WIN64 */
 
@@ -227,16 +245,11 @@ Py_NO_ENABLE_SHARED to find out.  Also support MS_NO_COREDLL for b/w compat */
 #elif defined(MS_WIN32)
 #	define PLATFORM "win32"
 #	define HAVE_LARGEFILE_SUPPORT
-#	ifdef _M_ALPHA
-#		define SIZEOF_VOID_P 8
-#		define SIZEOF_TIME_T 8
-#	else
 #	define SIZEOF_VOID_P 4
 #	define SIZEOF_TIME_T 4
 #	define SIZEOF_OFF_T 4
 #	define SIZEOF_FPOS_T 8
 #	define SIZEOF_HKEY 4
-#	endif
 #endif
 
 #ifdef _DEBUG