Add pycall_python_major_version function

Author: mrkn

ext/pycall/pycall.c

@@ -30,12 +30,21 @@ static VALUE python_type_mapping;
 static VALUE python_type_mapping;
 static ID id_python_type_mapping;
 
+int
+pycall_python_major_version(void)
+{
+  return python_major_version;
+}
+
 Py_ssize_t
 pycall_python_hexversion(void)
 {
   return python_hexversion;
 }
 
+#undef pycall_python_major_version
+#define pycall_python_major_version() python_major_version
+
 #undef pycall_python_hexversion
 #define pycall_python_hexversion() python_hexversion
 

ext/pycall/pycall_internal.h

@@ -620,6 +620,7 @@ typedef struct {
 pycall_libpython_api_table_t *pycall_libpython_api_table(void);
 #define Py_API(name) (pycall_libpython_api_table()->name)
 
+int pycall_python_major_version(void);
 Py_ssize_t pycall_python_hexversion(void);
 #define pycall_python_long_hash (pycall_python_hexversion() < 0x03020000)