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* m4: rewrite __attribute__((unused)) checkDmitry V. Levin2020-08-071-0/+16
Rewrite using AC_CACHE_CHECK to create a more readable autoconf macro. * m4/attribute.m4: New file. * m4/japhar_grep_cflags.m4: Remove. * m4/.gitignore: Replace japhar_grep_cflags.m4 with attribute.m4. * configure.ac: Replace AC_C___ATTRIBUTE__ with PAM_ATTRIBUTE_UNUSED.