set EXPR_COMPAT=1 if running inside freebsd so shFlags works correctly
set EXPR_COMPAT=1 if running inside freebsd so shFlags works correctly

Signed-off-by: Vincent Driessen <87e1f221a672a14a323e57bb65eaea19d3ed3804@3rdcloud.com>

JelteF/gitflow,dhilgarth/gitflow,yonglehou/gitflow-1,oddnoc/gitflow