graphics/gstreamer1-plugins-gl: Prevent fetch during build

If git(1) was found on the system, the port would attempt to download
OpenGL headers for a meson subproject from [1], which seems to only be
necessary/intended for Windows. Add '--wrap-mode=nodownload' to
MESON_ARGS to prevent this behavior. This only affects builds on live
systems.

While here: Remove unused glu dep from USE_GL and add jpeg dep as this
will link to libjpeg if found on the system. Tiny Makefile order fix.

[1] https://gitlab.freedesktop.org/gstreamer/meson-ports/gl-headers

PR:		270184
Reported by:	amdmi3

graphics/gstreamer1-plugins-gl/Makefile

@@ -1,4 +1,4 @@
-PORTREVISION=	0
+PORTREVISION=	1
 CATEGORIES=	graphics
 
 COMMENT=	GStreamer GL graphics plugin
@@ -7,11 +7,12 @@ BUILD_DEPENDS=	${LOCALBASE}/include/linux/input.h:devel/evdev-proto
 LIB_DEPENDS=	libgraphene-1.0.so:graphics/graphene \
 		libpng16.so:graphics/png
 
-USES=		gl
-USE_GL=		gl glu glesv2 egl
+USES=		gl jpeg
+USE_GL=		gl glesv2 egl
 USE_XORG+=	x11 xext xcb
 
-MESON_ARGS+=	-Dgl=enabled \
+MESON_ARGS+=	--wrap-mode=nodownload \
+		-Dgl=enabled \
 		-Dgl_winsys=${_GL_WINSYS:ts,} \
 		-Dgl_api=opengl,gles2 \
 		-Dgl_platform=glx,egl
@@ -24,9 +25,9 @@ OPTIONS_DEFINE=	WAYLAND
 OPTIONS_DEFAULT=WAYLAND
 OPTIONS_SUB=	yes
 
-WAYLAND_VARS=		_GL_WINSYS+=wayland
 WAYLAND_BUILD_DEPENDS=	wayland-protocols>=0:graphics/wayland-protocols
 WAYLAND_LIB_DEPENDS=	libwayland-egl.so:graphics/wayland
+WAYLAND_VARS=		_GL_WINSYS+=wayland
 
 DIST=		base
 GST_PLUGIN=	gl