test-xalloc-die: fix test for mingw When cross-compiling on mingw to target mingw, argv[0] still includes a .exe suffix. Rather than worry about ${EXEEXT}, just add a sed post-process. Also, simplify the script by using tests/init.sh. * modules/xalloc-die-tests (Files): Add tests/init.sh. * tests/test-xalloc-die.sh: Rewrite to use init.sh. Strip directory and .exe suffix off argv[0] output. Signed-off-by: Eric Blake <ebb9@byu.net>