master doesn't build on Win10

[Arash Esbati]

Hi all,

current master (commit 4dd8b2c086) doesn't build with Msys2.  The message
is (with manual line breaks added for better legibility):

--8<---------------cut here---------------start------------->8---
  CC       json.o
  CC       tparam.o
  CC       lastfile.o
  CCLD     temacs.exe
z:/pathto/x86_64-w64-mingw32/bin/ld.exe: image.o:image.c:(.text+0xbea2):
                undefined reference to `DGifSavedExtensionToGCB'
z:/pathto/x86_64-w64-mingw32/bin/ld.exe: image.o:image.c:(.text+0xc05e):
                undefined reference to `DGifSavedExtensionToGCB'
collect2.exe: error: ld returned 1 exit status
make[1]: *** [Makefile:647: temacs.exe] Error 1
--8<---------------cut here---------------end--------------->8---

I suspect it is due to change f9282e1d72[1].  My installed giflib
version is 5.2.1 (with GCC 11.2).  Is this a Windows only issue?

Best, Arash

Footnotes:
[1]  
http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f9282e1d724f1cb2e239f946957fdf02aa15dcc5