* configure.in: Win32 hosts shouldn't use install -x * install-sh: remove -x option, and special .exe-handling hack.
(INSTALL_PROGRAM): Use $(INSTALL_PROGRAM_ARGS). (INSTALL_SCRIPT): New variable. (BASE_FLAGS_TO_PASS): Pass down INSTALL_SCRIPT. * configure.in: If host is *-*-cygwin32*, set INSTALL_PROGRAM_ARGS to -x. * install-sh: Add support for -x option.