x11-toolkits/fltk: ensure that binary packages have complete feature support

Previously, binary packages would miss Xinerama and Xcursor dependencies and
thus were giving some odd behaviors as e.g. reported in the PR.  While here,
switch to USES+=localbase instead of manually amending CPPFLAGS and LDFLAGS.

PR:	213294

x11-toolkits/fltk/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	fltk
 PORTVERSION=	1.3.3
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	x11-toolkits
 MASTER_SITES=	http://fltk.org/pub/${PORTNAME}/${PORTVERSION}/
 DISTNAME=	${PORTNAME}-${PORTVERSION}-source
@@ -15,8 +15,8 @@ LICENSE=	LGPL20
 
 LIB_DEPENDS=	libpng.so:graphics/png
 
-USES=		jpeg pkgconfig
-USE_XORG=	xft
+USES=		jpeg localbase pkgconfig
+USE_XORG=	x11 xcursor xext xfixes xft xinerama
 USE_GL=		glu
 USE_LDCONFIG=	yes
 GNU_CONFIGURE=	yes
@@ -24,9 +24,6 @@ CONFIGURE_ARGS=	--enable-shared
 
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}
 
-CPPFLAGS+=	-I${LOCALBASE}/include
-LDFLAGS+=	-L${LOCALBASE}/lib
-
 PORTEXAMPLES=	*
 
 OPTIONS_DEFINE=	EXAMPLES