media-video/sonic-snap: add binding := to fltk & fix build with 1.4

1.4.x drops the case sensitivity compat symlinks by default
and upstream strongly recommends to fix packages rather than
re-enable them.

:= due to new soname

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

media-video/sonic-snap/files/sonic-snap-1.7-fltk1.4.patch

@@ -0,0 +1,6 @@
+Deprecated compatibility symlinks are removed.
+--- a/sonic-snap-gui.cxx
++++ b/sonic-snap-gui.cxx
+@@ -22 +22 @@
+-#include <FL/fl_file_chooser.H>
++#include <FL/Fl_File_Chooser.H>

media-video/sonic-snap/sonic-snap-1.7-r2.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -16,7 +16,7 @@ IUSE="mpeg"
 
 DEPEND="
 	sys-libs/zlib
-	x11-libs/fltk:1
+	x11-libs/fltk:1=
 	x11-libs/libX11
 	x11-libs/libXau
 	x11-libs/libXdmcp
@@ -31,6 +31,10 @@ CONFIG_CHECK="~USB_SN9C102"
 ERROR_USB_SN9C102="Please make sure the SN9C1xx PC Camera Controller driver is \
 enabled, under V4L USB devices, as a module in your kernel."
 
+PATCHES=(
+	"${FILESDIR}"/${P}-fltk1.4.patch
+)
+
 src_prepare() {
 	# fix bad assumptions
 	sed -i \