Build GTK 4 binaries

Currently the GTK4 binaries are not build as part of the build, this has
several drawbacks:

1) If anything is adjusted for GTK4 part it might break without notice
2) We have no GTK4 binaries by default

This enables *compilation* of the gtk4 parts to see at laest everything
can be compiled.

.github/workflows/maven.yml

@@ -43,7 +43,7 @@ jobs:
     - name: Install Linux requirements
       run: |
         sudo apt-get update -qq 
-        sudo apt-get install -qq -y libgtk-3-dev freeglut3-dev webkit2gtk-driver
+        sudo apt-get install -qq -y libgtk-3-dev libgtk-4-dev freeglut3-dev webkit2gtk-driver
       if: ${{ matrix.config.native == 'gtk.linux.x86_64'}}
     - name: Pull large static Windows binaries
       run: |

binaries/pom.xml

@@ -135,12 +135,10 @@
 														</exec>
 													</then>
 													<else>
-														<property name="gtk_version" value="3.0" />
 														<exec dir="${build_dir}" executable="sh" failonerror="true">
 															<arg line="build.sh"/>
 															<env key="SWT_JAVA_HOME" value="${SWT_JAVA_HOME}"/>
 															<env key="OUTPUT_DIR" value="${project.basedir}"/>
-															<env key="GTK_VERSION" value="${gtk_version}"/>
 															<env key="MODEL" value="${arch}"/>
 															<arg line="install clean"/>
 														</exec>

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

@@ -273,22 +273,22 @@ func_build_gtk3 () {
 	fi
 }
 
-if [ "$1" = "-gtk-all" ]; then
-	shift
-	func_echo_plus "Note: When building multiple GTK versions, a cleanup is required (and automatically performed) between them."
-	func_clean_up
-	func_build_gtk4 "$@"
-	func_clean_up
-	func_build_gtk3 "$@"
-elif [ "$1" = "-gtk4" ]; then
+if [ "$1" = "-gtk4" ]; then
 	shift
 	func_build_gtk4 "$@"
 elif [ "$1" = "-gtk3" ]; then
 	shift
 	func_build_gtk3 "$@"
 elif [ "${GTK_VERSION}" = "4.0" ]; then
 	func_build_gtk4 "$@"
-elif [ "${GTK_VERSION}" = "3.0" -o "${GTK_VERSION}" = "" ]; then
-	export GTK_VERSION="3.0"
+elif [ "${GTK_VERSION}" = "3.0" ]; then
+	func_build_gtk3 "$@"
+else
+	func_build_gtk3 "$@"
+	shift
+	func_echo_plus "Note: When building multiple GTK versions, a cleanup is required (and automatically performed) between them."
+	func_clean_up
+	func_build_gtk4 "$@"
+	func_clean_up
 	func_build_gtk3 "$@"
 fi

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/gtk3.h

@@ -10,6 +10,7 @@
  *
  * Contributors:
  *     Syntevo - initial API and implementation
+ * DUMMY CHANGE
  *******************************************************************************/
 
 #ifndef INC_gtk3_H