Fix a type in configure.ac and conform to POSIX strsignal #24
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We fix to items here, as per the commit messages:
configure.ac: fix typo. AC_CHECK_DECLS requires commas between declaration. The missing comma leads to HAVE_DECL_GETLINE_GETTIMEOFDAY which is non-sensical.
lib/strsignal.c: strsignal() should be not be declared const. POSIX requires strsignal() to return a pointer to a char, not a pointer to a const char. (see man 3 strsignal) On uClibc, and possibly other libcs, this causes problems with the correct declaration in string.h.