patch 9.1.2045: Mac: Build failure with Mac OS X 10.6

Problem:  Mac: Build failure with Mac OS X 10.6
          (Sergey Fedorov, after: v9.1.1748)
Solution: Add ifdefs MAC_OS_X_VERSION_10_7 around the code that sets the
          scheduler priority.

fixes:   #19044
related: #18120
closes:  #19054

Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: chrisbra

src/os_unix.c

@@ -3681,8 +3681,10 @@ mch_early_init(void)
      * threads’ quality of service classes clamped.
      */
 #ifdef MACOS_X
+# ifdef MAC_OS_X_VERSION_10_7
     integer_t policy = TASK_DEFAULT_APPLICATION;
     task_policy_set(mach_task_self(), TASK_CATEGORY_POLICY, &policy, 1);
+# endif
 #endif
 }
 

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2045,
 /**/
     2044,
 /**/