Revert "gdb: disable python when python is not available." This reverts commit b237e37439cb7f1135ddf12812613139d63ee657. Change-Id: I9b14fc88768c2e09db6be3a4e61b8239d7d7cf3d Reviewed-on: https://gerrit.chromium.org/gerrit/65744 Reviewed-by: Han Shen <shenhan@chromium.org> Commit-Queue: Yunlian Jiang <yunlian@chromium.org> Tested-by: Yunlian Jiang <yunlian@chromium.org>