Conditionally compile RKDotNetDateFormatter.h for iOS > 4.0 and OS X > 10.6. fixes RestKit#378, refs RestKit#568

Author: blakewatters

Code/Support/RKDotNetDateFormatter.h

@@ -8,6 +8,9 @@
 
 #import <Foundation/Foundation.h>
 
+// NSRegularExpression not available until OS X 10.7 and iOS 4.0 (NS_CLASS_AVAILABLE(10_7, 4_0))
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 1070 || __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
+
 /**
  A subclass of NSDateFormatter that serves as translator between ASP.NET date serializations in JSON
  strings and NSDate objects. This is useful for properly mapping these dates from an ASP.NET driven backend.
@@ -76,3 +79,5 @@
  */
 - (NSString *)stringFromDate:(NSDate *)date;
 @end
+
+#endif

Code/Support/RKDotNetDateFormatter.m

@@ -9,6 +9,8 @@
 #import "RKDotNetDateFormatter.h"
 #import "RestKit.h"
 
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 1070 || __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
+
 BOOL isValidRange(NSRange rangeOfMatch);
 NSTimeInterval secondsFromMilliseconds(NSTimeInterval millisecs);
 NSTimeInterval millisecondsFromSeconds(NSTimeInterval seconds);
@@ -101,3 +103,4 @@ NSTimeInterval millisecondsFromSeconds(NSTimeInterval seconds) {
     return seconds * 1000.f;
 }
 
+#endif