Introduce and check for MPD_VERSION_HEX for precise management of builds

with an external libmpdec.

Lib/decimal.py

@@ -140,7 +140,7 @@ __all__ = [
 
 __version__ = '1.70'    # Highest version of the spec this complies with
                         # See http://speleotrove.com/decimal/
-__libmpdec_version__ = "2.4.0" # compatible libmpdec version
+__libmpdec_version__ = "2.4.1" # compatible libmpdec version
 
 import math as _math
 import numbers as _numbers

Modules/_decimal/_decimal.c

@@ -39,8 +39,8 @@
 #include "memory.h"
 
 
-#if MPD_MAJOR_VERSION != 2
-  #error "libmpdec major version 2 required"
+#if !defined(MPD_VERSION_HEX) || MPD_VERSION_HEX < 0x02040100
+  #error "libmpdec version >= 2.4.1 required"
 #endif
 
 

Modules/_decimal/libmpdec/mpdecimal.h

@@ -108,9 +108,13 @@ MPD_PRAGMA(MPD_HIDE_SYMBOLS_START)
 
 #define MPD_MAJOR_VERSION 2
 #define MPD_MINOR_VERSION 4
-#define MPD_MICRO_VERSION 0
+#define MPD_MICRO_VERSION 1
 
-#define MPD_VERSION "2.4.0"
+#define MPD_VERSION "2.4.1"
+
+#define MPD_VERSION_HEX ((MPD_MAJOR_VERSION << 24) | \
+                         (MPD_MINOR_VERSION << 16) | \
+                         (MPD_MICRO_VERSION <<  8))
 
 const char *mpd_version(void);