Update sdl2_ttf.pas

fix #68

Author: ev1313

sdl2_ttf.pas

@@ -227,7 +227,7 @@ function TTF_RenderGlyph_Shaded(font: PTTF_Font; ch: UInt16; fg, bg: TSDL_Color)
 *}
 function TTF_RenderText_Blended(font: PTTF_Font; text: PAnsiChar; fg: TSDL_Color): PSDL_Surface cdecl; external TTF_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_TTF_RenderText_Blended' {$ENDIF} {$ENDIF};
 function TTF_RenderUTF8_Blended(font: PTTF_Font; text: PAnsiChar; fg: TSDL_Color): PSDL_Surface cdecl; external TTF_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_TTF_RenderUTF8_Blended' {$ENDIF} {$ENDIF};
-function TTF_RenderUNICODE_Blended(font: PTTF_Font; text: UInt16; fg: TSDL_Color): PSDL_Surface cdecl; external TTF_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_TTF_RenderUNICODE_Blended' {$ENDIF} {$ENDIF};
+function TTF_RenderUNICODE_Blended(font: PTTF_Font; text: PUInt16; fg: TSDL_Color): PSDL_Surface cdecl; external TTF_LibName {$IFDEF DELPHI} {$IFDEF MACOS} name '_TTF_RenderUNICODE_Blended' {$ENDIF} {$ENDIF};
 
 {* Create a 32-bit ARGB surface and render the given text at high quality,
    using alpha blending to dither the font with the given color.