Fix few signature inconsistencies (#437)

Helps with https://github.com/JetBrains/skiko/issues/431

skiko/src/commonMain/kotlin/org/jetbrains/skia/Canvas.kt

@@ -1630,7 +1630,7 @@ private external fun _nDrawPaint(ptr: NativePointer, paintPtr: NativePointer)
 private external fun _nSetMatrix(ptr: NativePointer, matrix: InteropPointer)
 
 @ExternalSymbolName("org_jetbrains_skia_Canvas__1nGetLocalToDevice")
-private external fun _nGetLocalToDevice(ptr: NativePointer, resultFloats: InteropPointer): FloatArray
+private external fun _nGetLocalToDevice(ptr: NativePointer, resultFloats: InteropPointer)
 
 @ExternalSymbolName("org_jetbrains_skia_Canvas__1nResetMatrix")
 private external fun _nResetMatrix(ptr: NativePointer)

skiko/src/commonMain/kotlin/org/jetbrains/skia/Font.kt

@@ -689,7 +689,7 @@ private external fun _nGetUTF32Glyphs(ptr: NativePointer, uni: InteropPointer, u
 private external fun _nGetStringGlyphsCount(ptr: NativePointer, str: InteropPointer, len: Int): Int
 
 @ExternalSymbolName("org_jetbrains_skia_Font__1nMeasureText")
-private external fun _nMeasureText(ptr: NativePointer, str: InteropPointer, len: Int, paintPtr: NativePointer, rect: InteropPointer): Rect
+private external fun _nMeasureText(ptr: NativePointer, str: InteropPointer, len: Int, paintPtr: NativePointer, rect: InteropPointer)
 
 @ExternalSymbolName("org_jetbrains_skia_Font__1nMeasureTextWidth")
 private external fun _nMeasureTextWidth(ptr: NativePointer, str: InteropPointer, len: Int, paintPtr: NativePointer): Float

skiko/src/commonMain/kotlin/org/jetbrains/skia/ManagedString.kt

@@ -71,7 +71,7 @@ private external fun _nMake(s: InteropPointer): NativePointer
 private external fun _nStringSize(ptr: NativePointer): Int
 
 @ExternalSymbolName("org_jetbrains_skia_ManagedString__nStringData")
-private external fun _nStringData(ptr: NativePointer, result: InteropPointer, size: Int): String
+private external fun _nStringData(ptr: NativePointer, result: InteropPointer, size: Int)
 
 @ExternalSymbolName("org_jetbrains_skia_ManagedString__1nInsert")
 private external fun _nInsert(ptr: NativePointer, offset: Int, s: InteropPointer)

skiko/src/commonMain/kotlin/org/jetbrains/skia/paragraph/Paragraph.kt

@@ -333,7 +333,6 @@ private external fun _nGetUnresolvedGlyphsCount(ptr: NativePointer): Int
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nUpdateAlignment")
 private external fun _nUpdateAlignment(ptr: NativePointer, Align: Int)
 
-
 @ExternalSymbolName("org_jetbrains_skia_paragraph_Paragraph__1nUpdateFontSize")
 private external fun _nUpdateFontSize(ptr: NativePointer, from: Int, to: Int, size: Float, textPtr: NativePointer)
 

skiko/src/nativeJsMain/cpp/paragraph/Paragraph.cc

@@ -121,7 +121,7 @@ SKIKO_EXPORT void org_jetbrains_skia_paragraph_Paragraph__1nGetWordBoundary
 }
 
 
-SKIKO_EXPORT KInteropPointerArray org_jetbrains_skia_paragraph_Paragraph__1nGetLineMetrics
+SKIKO_EXPORT KNativePointer org_jetbrains_skia_paragraph_Paragraph__1nGetLineMetrics
   (KNativePointer ptr, KNativePointer textPtr) {
     Paragraph* instance = reinterpret_cast<Paragraph*>((ptr));
     SkString* text = reinterpret_cast<SkString*>((textPtr));