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Fix Cygwin build warnings
Fixes the following build warnings under Cygwin:
cygwin.c: In function 'do_spawn':
cygwin.c:132:5: warning: assignment from incompatible pointer type
cygwin.c: In function 'XS_Cygwin_posix_to_win_path':
cygwin.c:346:9: warning: 'err' may be used uninitialized in this function
cygwin.c: In function 'XS_Cygwin_win_to_posix_path':
cygwin.c:257:9: warning: 'err' may be used uninitialized in this function