[embedded] Adjust test/embedded/dependencies-no-allocations.swift for correct putchar signature

Author: kubamracek

test/embedded/dependencies-no-allocations.swift

@@ -27,17 +27,18 @@
 // UNSUPPORTED: OS=linux-gnu && CPU=aarch64
 
 @_silgen_name("putchar")
-func putchar(_: UInt8)
+@discardableResult
+func putchar(_: CInt) -> CInt
 
 public func print(_ s: StaticString, terminator: StaticString = "\n") {
   var p = s.utf8Start
   while p.pointee != 0 {
-    putchar(p.pointee)
+    putchar(CInt(p.pointee))
     p += 1
   }
   p = terminator.utf8Start
   while p.pointee != 0 {
-    putchar(p.pointee)
+    putchar(CInt(p.pointee))
     p += 1
   }
 }