Add: OpenBSD

Fixes mattn#321

Author: gjrtimmer

sqlite3_libsqlite3.go

@@ -11,6 +11,7 @@ package sqlite3
 #cgo CFLAGS: -DUSE_LIBSQLITE3
 #cgo linux LDFLAGS: -lsqlite3
 #cgo darwin LDFLAGS: -L/usr/local/opt/sqlite/lib -lsqlite3
+#cgo openbsd LDFLAGS: -lsqlite3
 #cgo solaris LDFLAGS: -lsqlite3
 */
 import "C"

sqlite3_opt_icu.go

@@ -12,5 +12,6 @@ package sqlite3
 #cgo CFLAGS: -DSQLITE_ENABLE_ICU
 #cgo darwin CFLAGS: -I/usr/local/opt/icu4c/include
 #cgo darwin LDFLAGS: -L/usr/local/opt/icu4c/lib
+#cgo openbsd LDFLAGS: -lsqlite3
 */
 import "C"