gradle-plugin Use a script-block to specify include directories

Replace headerFilterAdditionalSearchPrefix cinterop option with
includeDir script block:

includeDir {
    allHeaders 'path' // Used for all headers (an analogue of -I<path>)
    // Used only for headers in headerFilter
    // (replacement for headerFilterAdditionalSearchPrefix)
    headerFilterOnly 'path'
}

samples/libcurl/build.gradle

@@ -5,10 +5,10 @@ konan.targets = ['macbook', 'linux']
 konanArtifacts {
     interop('libcurl') {
         target('linux') {
-            headerFilterAdditionalSearchPrefixes '/usr/include'
+            includeDirs.headerFilterOnly '/usr/include'
         }
         target('macbook') {
-            headerFilterAdditionalSearchPrefixes '/opt/local/include', '/usr/local/include'
+            includeDirs.headerFilterOnly '/opt/local/include', '/usr/local/include'
         }
     }