musl: fix missing <sys/time.h>.

Issue peported by Ethan Hawk. Our socket.c module is using struct
timeval without including <sys/time.h>, which breaks on musl.

* configure: in the select test, let's include <sys/time.h>, and
if the test passes, let's set have_sys_time, so that HAVE_SELECT
implies HAVE_SYS_TIME. This way code wrapped with HAVE_SELECT doesn't
separately have to test for HAVE_SYS_TIME.

* socket.c: If HAVE_SYS_TIME is true, then we include <sys/time.h>,
independently of HAVE_SELECT.
(sock_timeout, sock_load_init): Like the select-based code, code using
SO_SNDTIMEO or SO_RCVTIMO also uses timeval, so needs to be wrapped with
HAVE_SYS_TIME.

1 files changed, 2 insertions, 0 deletions

diff --git a/configure b/configure
index ead8bccc..63f1ec5c 100755
--- a/configure
+++ b/configure
@@ -3480,6 +3480,7 @@ if [ $have_sockets ] ; then
 
   cat > conftest.c <<!
 #include <sys/select.h>
+#include <sys/time.h>
 
 int main(int argc, char **argv)
 {
@@ -3494,6 +3495,7 @@ int main(int argc, char **argv)
   if conftest; then
     printf "yes\n"
     printf "#define HAVE_SELECT 1\n" >> config.h
+    have_sys_time=y
   else
     printf "no\n"
   fi