Don't clobber existing prototypes. Since OpenLayers doesn't use 'foo.bind'

anymore, preferring OpenLayers.Function.bind(function, object), we don't
need to provide this -- so if someone provides something different, don't 
clobber it. (Closes #962)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@4339 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/BaseTypes.js

@@ -83,6 +83,7 @@ OpenLayers.String = {
     }
 };
 
+if (!String.prototype.startsWith) {
     /**
      * APIMethod: String.startsWith
      * Deprecated. Whether or not a string starts with another string. 
@@ -100,7 +101,9 @@ String.prototype.startsWith = function(sStart) {
         );
         return OpenLayers.String.startsWith(this, sStart);
     };
+}
 
+if (!String.prototype.contains) {
     /**
      * APIMethod: String.contains
      * Deprecated. Whether or not a string contains another string.
@@ -118,7 +121,9 @@ String.prototype.contains = function(str) {
         );
         return OpenLayers.String.contains(this, str);
     };
+}
 
+if (!String.prototype.trim) {
     /**
      * APIMethod: String.trim
      * Deprecated. Removes leading and trailing whitespace characters from a string.
@@ -134,7 +139,9 @@ String.prototype.trim = function() {
         );
         return OpenLayers.String.trim(this);
     };
+}
 
+if (!String.prototype.camelize) {
     /**
      * APIMethod: camelize
      * Deprecated. Camel-case a hyphenated string. 
@@ -151,7 +158,7 @@ String.prototype.camelize = function() {
         );
         return OpenLayers.String.camelize(this);
     };
-
+}
 
 /*********************
  *                   *
@@ -183,6 +190,7 @@ OpenLayers.Number = {
     }
 };
 
+if (!Number.prototype.limitSigDigs) {
     /**
      * APIMethod: Number.limitSigDigs
      * Deprecated. Limit the number of significant digits on an integer. Does *not*
@@ -202,7 +210,7 @@ Number.prototype.limitSigDigs = function(sig) {
         );
         return OpenLayers.Number.limitSigDigs(this, sig);
     };
-
+}
 
 /*********************
  *                   *
@@ -255,6 +263,7 @@ OpenLayers.Function = {
     }
 };
 
+if (!Function.prototype.bind) {
     /**
      * APIMethod: Function.bind
      * Deprecated. Bind a function to an object. 
@@ -276,7 +285,9 @@ Function.prototype.bind = function() {
         Array.prototype.unshift.apply(arguments, [this]);
         return OpenLayers.Function.bind.apply(null, arguments);
     };
+}
 
+if (!Function.prototype.bindAsEventListener) {
     /**
      * APIMethod: Function.bindAsEventListener
      * Deprecated. Bind a function to an object, and configure it to receive the
@@ -295,3 +306,4 @@ Function.prototype.bindAsEventListener = function(object) {
         );
         return OpenLayers.Function.bindAsEventListener(this, object);
     };
+}