srs: include signal.h

srs.c uses functions like signal and define like SIGPIPE, which come from
the signal.h header from the C standard library.

While for some reason this didn't create compilation issues in Replicant 6,
compiling libsamsung-ril with Guix[1] fails because of that.

References:
-----------
[1]At the time of writing, the libsamsung-ril is not yet in Guix, however
   an unofficial package does exist, and is being worked on[2].
   If srs.c is patched to include signal.h, that unofficial libsamsung-ril
   packages does compile successfully.
[2]https://git.replicant.us/contrib/GNUtoo/guix/log/?h=libsamsung-ril

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/srs.c b/srs.c
index 1f6c320..505210b 100644
--- a/srs.c
+++ b/srs.c
@@ -19,6 +19,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <signal.h>
 #include <stdlib.h>
 
 #include <sys/eventfd.h>