build: missing-noreturn warnings are errors

Remove the temporary 'no-error' for the newly-added warning.

Signed-off-by: Mark Stapp <[email protected]>

Author: Mark Stapp

configure.ac

@@ -469,7 +469,6 @@ AC_C_FLAG([-Wundef])
 AC_C_FLAG([-Wimplicit-fallthrough])
 AC_C_FLAG([-Wshadow])
 AC_C_FLAG([-Wmissing-noreturn])
-AC_C_FLAG([-Wno-error=missing-noreturn])
 if test "$enable_gcc_ultra_verbose" = "yes" ; then
   AC_C_FLAG([-Wcast-qual])
   AC_C_FLAG([-Wmissing-format-attribute])