Get rid of macOS 10.7 version checks, they're always true

We don't support OS X < 10.7 anyhow any more.

include/wx/osx/cocoa/chkconf.h

@@ -41,13 +41,10 @@
 
 /*
    Use the more efficient FSEvents API instead of kqueue
-   events for file system watcher, but only on OS X >= 10.7 since
-   that version introduced a flag that allows watching files as
-   well as sub directories.
+   events for file system watcher since that version introduced a flag that
+   allows watching files as well as sub directories.
  */
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_7
-    #define wxHAVE_FSEVENTS_FILE_NOTIFICATIONS 1
-#endif
+#define wxHAVE_FSEVENTS_FILE_NOTIFICATIONS 1
 
 /*
  * turning off capabilities that don't work under cocoa yet

include/wx/osx/config_xcode.h

@@ -24,7 +24,6 @@
 #define HAVE_VA_COPY 1
 #define HAVE_VARIADIC_MACROS 1
 #define HAVE_STD_WSTRING 1
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
 #if __GNUC__ > 4 || (  __GNUC__ == 4 && __GNUC_MINOR__ >= 2 )
   #if !defined(__has_include)
     #define HAVE_TR1_UNORDERED_MAP 1
@@ -33,7 +32,6 @@
   #endif
   #define HAVE_GCC_ATOMIC_BUILTINS 1
 #endif
-#endif
 #define HAVE_VISIBILITY 1
 #define wxHAVE_PTHREAD_CLEANUP 1
 #define CONST_COMPATIBILITY 0

src/osx/core/bitmap.cpp

@@ -495,11 +495,10 @@ IconRef wxBitmapRefData::GetIconRef()
         
         switch (sz)
         {
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
             case 1024:
                 dataType = kIconServices1024PixelDataARGB;
                 break;
-#endif
+
             case 512:
                 dataType = kIconServices512PixelDataARGB;
                 break;

src/osx/utils_osx.cpp

@@ -63,13 +63,6 @@ bool wxColourDisplay()
 
 #if wxOSX_USE_COCOA_OR_CARBON
 
-#if (MAC_OS_X_VERSION_MAX_ALLOWED >= 1070) && (MAC_OS_X_VERSION_MIN_REQUIRED < 1060)
-// bring back declaration so that we can support deployment targets < 10_6
-CG_EXTERN size_t CGDisplayBitsPerPixel(CGDirectDisplayID display)
-CG_AVAILABLE_BUT_DEPRECATED(__MAC_10_0, __MAC_10_6,
-                            __IPHONE_NA, __IPHONE_NA);
-#endif
-
 // Returns depth of screen
 int wxDisplayDepth()
 {