/ curl Public
configure: resolve conflict with AC_CHECK_HEADERS #766
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AC_CHECK_HEADERS produces `ac_cv_header_*_h' cache variables, which
conflict with curl-specific header check for windows.h. By renaming the
variable used by curl, any conflict with other projects and shared
config.caches is resolved. The conflict occurs under CYGWIN, as
AC_CHECK_HEADERS (from a different project) will set
ac_cv_header_windows_h=1, while the expected value for curl is 0.