Dropped HAVE_PQFREEMEM flag

It was necessary before PG 7.4, in versions which have long been unsupported.

psycopg/config.h

@@ -152,11 +152,6 @@ static double round(double num)
 }
 #endif
 
-/* postgresql < 7.4 does not have PQfreemem */
-#ifndef HAVE_PQFREEMEM
-#define PQfreemem free
-#endif
-
 /* resolve missing isinf() function for Solaris */
 #if defined (__SVR4) && defined (__sun)
 #include <ieeefp.h>

setup.cfg

@@ -1,5 +1,5 @@
 [build_ext]
-define=HAVE_PQFREEMEM
+define=
 
 # PSYCOPG_DISPLAY_SIZE enable display size calculation (a little slower)
 # HAVE_PQFREEMEM should be defined on PostgreSQL >= 7.4

setup.py

@@ -538,7 +538,8 @@ else:
 # when called e.g. with "pip -e git+url'. This results in declarations
 # duplicate on the commandline, which I hope is not a problem.
 for define in parser.get('build_ext', 'define').split(','):
-    define_macros.append((define, '1'))
+    if define:
+        define_macros.append((define, '1'))
 
 # build the extension