fix(ios): resolve compile error when using dynamically linked frameworks

Fixes #27

Author: alpha0010

ios/PdfUtilModule.mm

@@ -1,5 +1,10 @@
 #import "PdfUtilModule.h"
+
+#if __has_include(<react_native_pdf_light/react_native_pdf_light-Swift.h>)
+#import <react_native_pdf_light/react_native_pdf_light-Swift.h>
+#else
 #import "react_native_pdf_light-Swift.h"
+#endif
 
 @implementation PdfUtilModule {
     PdfUtilModuleImpl *impl;

ios/PdfView.mm

@@ -1,7 +1,13 @@
 #import "PdfView.h"
-#import "react_native_pdf_light-Swift.h"
 
+#if __has_include(<react_native_pdf_light/react_native_pdf_light-Swift.h>)
+#import <react_native_pdf_light/react_native_pdf_light-Swift.h>
+#import <react_native_pdf_light/react/renderer/components/PdfViewSpec/ComponentDescriptors.h>
+#else
+#import "react_native_pdf_light-Swift.h"
 #import <react/renderer/components/PdfViewSpec/ComponentDescriptors.h>
+#endif
+
 #import <react/renderer/components/PdfViewSpec/EventEmitters.h>
 #import <react/renderer/components/PdfViewSpec/Props.h>
 #import <react/renderer/components/PdfViewSpec/RCTComponentViewHelpers.h>