Using the framework import instead of module import to support project without clang module

Author: dreampiggy

SDWebImageWebPCoder/Classes/SDImageWebPCoder.h

@@ -6,8 +6,7 @@
  * file that was distributed with this source code.
  */
 
-#import <Foundation/Foundation.h>
-@import SDWebImage;
+#import <SDWebImage/SDWebImage.h>
 
 /**
  Built in coder that supports WebP and animated WebP

SDWebImageWebPCoder/Classes/UIImage+WebP.h

@@ -6,7 +6,7 @@
  * file that was distributed with this source code.
  */
 
-@import SDWebImage;
+#import <SDWebImage/SDWebImage.h>
 
 // This category is just use as a convenience method. For more detail control, use methods in `UIImage+MultiFormat.h` or directlly use `SDImageCoder`
 @interface UIImage (WebP)