Fix build with musl

[passgat]

This was exposed while integrating the package into Buildroot and testing its compilation with a musl-based toolchain:

CANvenient_SocketCAN.c: In function 'socketcan_open':
CANvenient_SocketCAN.c:186:24: error: storage size of 'tv' isn't known
186 | struct timeval tv;
| ^~
CANvenient_SocketCAN.c: In function 'socketcan_recv':
CANvenient_SocketCAN.c:364:36: error: invalid application of 'sizeof' to incomplete type 'struct timeval'
364 | char ctrlmsg[CMSG_SPACE(sizeof(struct timeval))];
| ^~~~~~
CANvenient_SocketCAN.c:406:28: error: invalid use of undefined type 'const struct timeval'
406 | *timestamp = tv->tv_sec * 1000000ULL + tv->tv_usec;
| ^~

Include <sys/time.h> to fix the build.

[codacy-production]

Up to standards ✅

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[passgat]

A gentle ping.

The patch has been applied in the Buildroot integration of CANopenterm package.
https://patchwork.ozlabs.org/project/buildroot/list/?series=519871

[mupfdev]

Thanks!