[PATCH] maint.mk: avoid redundant file name in message

$(_sc_search_regexp) already prefixes its errors with $(ME), so failure on one of these rules looked like: maint.mk: maint.mk: replace strcmp calls above with STREQ/STRNEQ * top/maint.mk (sc_prohibit_strcmp, sc_unmarked_diagnostics) (sc_prohibit_defined_have_decl_tests, sc_const_long_option)

Re: [PATCH] maint.mk: avoid redundant file name in message

Eric Blake wrote: $(_sc_search_regexp) already prefixes its errors with $(ME), so failure on one of these rules looked like: maint.mk: maint.mk: replace strcmp calls above with STREQ/STRNEQ * top/maint.mk (sc_prohibit_strcmp, sc_unmarked_diagnostics) (sc_prohibit_defined_have_decl_tests,