Remove reference to Webkit in Win32 readme #1878

Back then, Webkit was provided as an alternative browser backend for SWT
on Windows. It has not been part of the build for quite some time and
the Webkit binaries for Windows are also not available anymore.
This cleans up the readme still containing information that refers to
Webkit for Windows,.

Fixes #1878

Author: HeikoKlare

bundles/org.eclipse.swt/Readme.Win32.md

@@ -24,30 +24,3 @@ You need to install the following on your system:
 Import and build the SWT project `bundles/org.eclipse.swt` and `binaries/org.eclipse.swt.win32.win32.${arch}` in Eclipse.
 
 See **Building and Testing locally** in [Readme.md](Readme.md) for further instructions.
-
-## (More advanced) (Optional) Building Webkit
-Note, I.E is the default backend. But Webkit is also a possible alternative Browser backend.
-
-Disclaimer:
-
-Note Webkit SDKs are an older version being consumed by SWT native build process and Webkit build binaries are no more available for download in public Webkit download page (https://webkit.org/downloads/)
-
-But WebKit-r72896 sources are still avilable for download via either of:
-https://builds-nightly.webkit.org/files/trunk/src/WebKit-r72896.tar.bz2  
-http://build.eclipse.org/eclipse/swt/WebKit-r72896.tar.bz2  
-
-Webkit SDKs:  
-
-* WebKit-r72896 http://build.eclipse.org/eclipse/swt/WebKit-r72896.zip
-* WebKitSupportLibrary http://build.eclipse.org/eclipse/swt/WebKitSupportLibrary.zip
-
-
-Steps:  
-
-* Create an SWT Build dir such as `C:\SWT_BUILD_DIR`
-* In your enviornment:  
-    `set SWT_BUILD_DIR=YOUR.DIR`
-* Unzip two Webkit SDks into:  
-  - `SWT_BUILD_DIR\Webkit\r72896`  
-  - `SWT_BLUID_DIR\Webkit\SupportLibrary`  
-  - (Note: SWT's Webkit support exists for SWT 32bit on Windows, so Webkit SDKs are consumed only by the SWT 32bit build process)