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AX_CHECK_FLAG: Fix to work with autoconf 2.59
• AS_VAR_PUSHDEF([FLAGS], [something containing FLAGS]) caused an infinite loop before v2.65~21. • AS_VAR_APPEND was new in v2.63b~224. • AS_VAR_IF was new in v2.63~27. • AS_ECHO was new in AUTOCONF-2.61a~45, and AC_PROG_GREP in AUTOCONF-2.59c~744, but their use here is more idiomatically replaced with a case pattern anyway. • Before AUTOCONF-2.60b~8, the variable name passed to AC_CACHE_CHECK, AS_VAR_GET, AS_VAR_SET, and AS_VAR_SET_IF must be left unquoted. Signed-off-by: Anders Kaseorg <firstname.lastname@example.org> (cherry picked from autoconf-archive commit f5ed01f0ce1d9b3be7c0cd92db192bf5c44d7fcb)
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