Allow building on OpenBSD (#976)

Author: ledeuns

sqlite3.go

@@ -21,6 +21,8 @@ package sqlite3
 #cgo CFLAGS: -DSQLITE_ENABLE_UPDATE_DELETE_LIMIT
 #cgo CFLAGS: -Wno-deprecated-declarations
 #cgo linux,!android CFLAGS: -DHAVE_PREAD64=1 -DHAVE_PWRITE64=1
+#cgo openbsd CFLAGS: -I/usr/local/include
+#cgo openbsd LDFLAGS: -L/usr/local/lib
 #ifndef USE_LIBSQLITE3
 #include <sqlite3-binding.h>
 #else