fltk: upgrade 1.3.7 -> 1.3.8

Changes in FLTK 1.3.8
- Make "FLTK_CONSOLIDATE_MOTION" user-definable (issue openembedded#76)
- Fix compiler warnings (backported from 1.4)
- Add new dialog fl_choice_n() with extended return values (openembedded#282)
- Account for deprecation of [NSBitmapImageRep initWithFocusedViewRect:]
  in macOS 10.14
- macOS: fix fullscreen window when other windows were created before
- Fix issue openembedded#279: "HiDpi issue on macOS with retina display"
- Fix issue openembedded#287: "FLTK 1.3.6 doesn't handle fullscreen on macOS"
- Fix issue openembedded#288: "FLTK 1.3.6+ doesn't notify window movement on macOS"
- macOS: Allow building with non-Apple compiler that may not support blocks

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/fltk/fltk.inc

@@ -11,8 +11,8 @@ SRC_URI = " \
     file://0002-always-build-fluid-and-export-pointers.patch \
 "
 
-PV = "1.3.7"
-SRC_URI[sha256sum] = "5ff1e90766ff4216e78e9a19a9bf527e6258f04accccd4429e9bb829b01d690d"
+PV = "1.3.8"
+SRC_URI[sha256sum] = "1d9832409fc08c908c64ab40ad9fd8b0e8af5d203651eb9690b810f41e2f412d"
 
 inherit cmake pkgconfig