Remove libiconv dependency

Author: jim-easterbrook

conanfile.py

@@ -32,9 +32,6 @@ def requirements(self):
         if self.options.webready:
             self.requires('libcurl/8.10.1')
 
-        if os_info.is_windows and self.options.iconv:
-            self.requires('libiconv/1.17')
-
         if self.options.unitTests:
             self.requires('gtest/1.15.0')