m4.recipe: Bump to 1.4.19 to fix build error on Fedora 35
ccache gcc -I. -Wall -g -O2 -m64 -Wall -g -O2 -Wno-error=cast-align -MT closeout.o -MD -MP -MF $depbase.Tpo -c -o closeout.o closeout.c &&\
mv -f $depbase.Tpo $depbase.Po
In file included from /usr/include/signal.h:328,
from ./signal.h:52,
from c-stack.c:49:
c-stack.c:55:26: error: missing binary operator before token "("
55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384
| ^~~~~~~~
Edited by Nirbheek Chauhan