Remove callbacks-related hacks from samples/libcurl

samples/libcurl/callbacks.h

@@ -1,5 +0,0 @@
-#include <stddef.h>
-
-// Those types are needed but not defined or used in libcurl headers.
-typedef size_t header_callback(char *buffer,   size_t size,   size_t nitems, void *userdata);
-typedef size_t write_data_callback(void *buffer, size_t size, size_t nmemb, void *userp);

samples/libcurl/libcurl.def

@@ -1,2 +1,2 @@
-headers = curl/curl.h callbacks.h
+headers = curl/curl.h
 excludedFunctions = zopen pfctlinput

samples/libcurl/src/org/konan/libcurl/CUrl.kt

@@ -10,7 +10,7 @@ class CUrl(val url: String)  {
 
     init {
         curl_easy_setopt(curl, CURLOPT_URL, url)
-        val header: CPointer<header_callback> = staticCFunction(::header_callback)
+        val header = staticCFunction(::header_callback)
         curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header)
         curl_easy_setopt(curl, CURLOPT_HEADERDATA, stablePtr.value)
     }

samples/libcurl/src/org/konan/libcurl/Program.kt

@@ -12,7 +12,7 @@ fun main(args: Array<String>) {
     curl.close()
 
 /*
-    val write_data: CPointer<write_data_callback> = staticCFunction(::write_data)
+    val write_data = staticCFunction(::write_data)
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
 */
 }