Warnings building master

[Andy Moreton]

Building emacs master on Windows (msys2 64bit with gcc 10.3.0) now
generates the following warnings:

  CC       image.o
C:/emacs/git/emacs/master/src/image.c:7788:1: warning: 'uint32' is deprecated 
[-Wdeprecated-declarations]
 7788 | DEF_DLL_FN (int, TIFFReadRGBAImage, (TIFF *, uint32, uint32, uint32 *, 
int));
      | ^~~~~~~~~~
C:/emacs/git/emacs/master/src/image.c:7788:1: warning: 'uint32' is deprecated 
[-Wdeprecated-declarations]
C:/emacs/git/emacs/master/src/image.c:7788:1: warning: 'uint32' is deprecated 
[-Wdeprecated-declarations]
C:/emacs/git/emacs/master/src/image.c: In function 'tiff_load':
C:/emacs/git/emacs/master/src/image.c:7980:3: warning: 'uint32' is deprecated 
[-Wdeprecated-declarations]
 7980 |   uint32 *buf;
      |   ^~~~~~
C:/emacs/git/emacs/master/src/image.c:8106:7: warning: 'uint32' is deprecated 
[-Wdeprecated-declarations]
 8106 |       uint32 *row = buf + y * width;
      |       ^~~~~~
C:/emacs/git/emacs/master/src/image.c:8110:4: warning: 'uint32' is deprecated 
[-Wdeprecated-declarations]
 8110 |    uint32 abgr = row[x];
      |    ^~~~~~

It appears that this code needs to be updated to use C99 integer types.

    AndyM