Support Boolean in interop varargs and function pointers invocation

backend.native/tests/interop/basics/4.kt

@@ -5,8 +5,8 @@ val stdout
     get() = getStdout()
 
 fun main(args: Array<String>) {
-    fprintf(stdout, "%s %s %d %d %d %lld %.1f %.1lf\n",
-            "a", "b".cstr, (-1).toByte(), 2.toShort(), 3, Long.MAX_VALUE, 0.1.toFloat(), 0.2)
+    fprintf(stdout, "%s %s %d %d %d %lld %.1f %.1lf %d %d\n",
+            "a", "b".cstr, (-1).toByte(), 2.toShort(), 3, Long.MAX_VALUE, 0.1.toFloat(), 0.2, true, false)
 
     memScoped {
         val aVar = alloc<IntVar>()

backend.native/tests/interop/basics/cfunptr.def

@@ -41,4 +41,14 @@ typedef int (*doubleToIntPtrType)(double);
 
 static doubleToIntPtrType getDoubleToIntPtr() {
     return &__doubleToInt;
+}
+
+static _Bool __isIntPositive(int x) {
+    return x > 0;
+}
+
+typedef _Bool (*isIntPositivePtrType)(int);
+
+static isIntPositivePtrType getIsIntPositivePtr() {
+    return &__isIntPositive;
 }

backend.native/tests/interop/basics/funptr.kt

@@ -18,4 +18,11 @@ fun main(args: Array<String>) {
                     getAddPtr()!!(5.1, 12.2)
             )
     )
-}
+
+    val isIntPositivePtr = getIsIntPositivePtr()!!
+
+    printIntPtr(isIntPositivePtr(42).ifThenOneElseZero())
+    printIntPtr(isIntPositivePtr(-42).ifThenOneElseZero())
+}
+
+fun Boolean.ifThenOneElseZero() = if (this) 1 else 0