Fixed some typos, courtesy of codespell

Main change is the conversion from the British cancelling/-ed to the
American canceling/-ed.

src/frontends/android/app/src/main/java/org/strongswan/android/logic/SimpleFetcher.java

@@ -118,7 +118,7 @@ public class SimpleFetcher
 	/**
 	 * Disable the fetcher and abort any future requests.
 	 *
-	 * The native thread is not cancelable as it is working on an IKE_SA (cancelling the methods of
+	 * The native thread is not cancelable as it is working on an IKE_SA (canceling the methods of
 	 * HttpURLConnection is not reliably possible anyway), so to abort while fetching we cancel the
 	 * Future (causing a return from fetch() immediately) and let the executor thread continue its
 	 * thing in the background.

src/frontends/android/gradlew.bat

@@ -46,7 +46,7 @@ echo location of your Java installation.
 goto fail
 
 :init
-@rem Get command-line arguments, handling Windowz variants
+@rem Get command-line arguments, handling Windows variants
 
 if not "%OS%" == "Windows_NT" goto win9xME_args
 if "%@eval[2+2]" == "4" goto 4NT_args

src/frontends/osx/charon-xpc/xpc_channels.c

@@ -64,7 +64,7 @@ typedef struct {
 } entry_t;
 
 /**
- * Clean up an entry, cancelling connection
+ * Clean up an entry, canceling connection
  */
 static void destroy_entry(entry_t *entry)
 {