net/alg.c: Include compat.h.

This patch fixes this build error with glibc before 2.13.

  CC	net/alg.o
net/alg.c: In function ‘alg_gen_sockaddr’:
net/alg.c:21: error: ‘PF_ALG’ undeclared (first use in this function)
net/alg.c:21: error: (Each undeclared identifier is reported only once
net/alg.c:21: error: for each function it appears in.)

Signed-off-by: Vinson Lee <vlee@twitter.com>
net/caif.c: Include compat.h.

This patch fixes this build error with glibc before 2.13.

  CC    net/caif.o
net/caif.c: In function ‘caif_gen_sockaddr’:
net/caif.c:22: error: ‘PF_CAIF’ undeclared (first use in this function)
net/caif.c:22: error: (Each undeclared identifier is reported only once
net/caif.c:22: error: for each function it appears in.)
make: *** [net/caif.o] Error 1

Signed-off-by: Vinson Lee <vlee@twitter.com>