[Build] Update MACOSX_DEPLOYMENT_TARGET to macOS 11

And enable the compiler options equivalent to the Xcode options
- CLANG_WARN_UNGUARDED_AVAILABILITY = yes
- GCC_TREAT_WARNINGS_AS_ERRORS = yes

Author: HannesWell

bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/build.sh

@@ -29,6 +29,6 @@ elif [ "x${MODEL}" = "xarm64" ] || [ "x${MODEL}" = "xaarch64" ]; then
 	fi
 fi
 
-export MACOSX_DEPLOYMENT_TARGET=10.10
+export MACOSX_DEPLOYMENT_TARGET=11
 
 make -f make_macosx.mak $1 $2 $3 $4 $5 $6 $7 $8 $9

bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/make_macosx.mak

@@ -34,6 +34,7 @@ AWT_OBJECTS   = swt_awt.o
 
 #SWT_DEBUG = -g
 CFLAGS = -c -xobjective-c -Wall $(ARCHS) $(SWT_DEBUG) -DUSE_ASSEMBLER -DCOCOA -DATOMIC \
+	-Wunguarded-availability \
 	-I $(SWT_JAVA_HOME)/include \
 	-I $(SWT_JAVA_HOME)/include/darwin \
 	-I /System/Library/Frameworks/Cocoa.framework/Headers \

bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Display.java

@@ -950,8 +950,8 @@ protected void create (DeviceData data) {
 }
 
 void createDisplay (DeviceData data) {
-	if (OS.VERSION < OS.VERSION (10, 10, 0)) {
-		System.out.println ("***WARNING: SWT requires MacOS X version 10.10 or greater"); //$NON-NLS-1$
+	if (OS.VERSION < OS.VERSION (11, 0, 0)) {
+		System.out.println ("***WARNING: SWT requires macOS version 11 or greater"); //$NON-NLS-1$
 		error(SWT.ERROR_NOT_IMPLEMENTED);
 	}
 
@@ -2522,10 +2522,10 @@ public void run() {
 
 /**
  * Checks if the native item height should be enforced as a minimum (which is true by default).
- * 
+ *
  * Newer version of macOS may use a default item height in Table, Tree and List
  * controls that is larger than what is traditionally expected.
- * 
+ *
  * Enforcing the default height as a minimum may break existing assumptions and
  * render UI elements with a padding that may be considered too large.
  */