Nuked almost all trailing white space.

We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces.  In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much.  For future commits the pre-commit scripts
checks that this won't happen again.

g10/options.h

@@ -31,7 +31,7 @@
 #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
 #define EXTERN_UNLESS_MAIN_MODULE extern
 #else
-#define EXTERN_UNLESS_MAIN_MODULE 
+#define EXTERN_UNLESS_MAIN_MODULE
 #endif
 #endif
 
@@ -96,7 +96,7 @@ struct
   int completes_needed;
   int max_cert_depth;
   const char *homedir;
-  const char *agent_program; 
+  const char *agent_program;
 
   /* Options to be passed to the gpg-agent */
   session_env_t session_env;
@@ -202,7 +202,7 @@ struct
 
   /* If > 0, limit the number of card insertion prompts to this
      value. */
-  int limit_card_insert_tries; 
+  int limit_card_insert_tries;
 
 #ifdef ENABLE_CARD_SUPPORT
   /* FIXME: We don't needs this here as it is done in scdaemon. */
@@ -231,8 +231,8 @@ struct
     enum {
       AKL_NODEFAULT,
       AKL_LOCAL,
-      AKL_CERT, 
-      AKL_PKA, 
+      AKL_CERT,
+      AKL_PKA,
       AKL_LDAP,
       AKL_KEYSERVER,
       AKL_SPEC