make.doc: fixed rare dynamic linking bug with doc-deep target
make.doc: fixed rare dynamic linking bug with doc-deep target

richarddzh/vlfeat,cvfish/vlfeat,rxl194/vlfeat,WangDequan/vlfeat,j-bo/vlfeat,erexhepa/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,qubick/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,WangDequan/vlfeat,cvfish/vlfeat,qubick/vlfeat,qubick/vlfeat,qubick/vlfeat,cvfish/vlfeat,hongzhili/vlfeat,mylxiaoyi/vlfeat,mylxiaoyi/vlfeat,vlfeat/vlfeat,vlfeat/vlfeat,j-bo/vlfeat,richarddzh/vlfeat,erexhepa/vlfeat,j-bo/vlfeat,mylxiaoyi/vlfeat,erexhepa/vlfeat,vlfeat/vlfeat,mylxiaoyi/vlfeat,richarddzh/vlfeat,CansenJIANG/vlfeat,rxl194/vlfeat,mylxiaoyi/vlfeat,hongzhili/vlfeat,richarddzh/vlfeat,qubick/vlfeat,CansenJIANG/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,WangDequan/vlfeat,CansenJIANG/vlfeat,rxl194/vlfeat,hongzhili/vlfeat,erexhepa/vlfeat,WangDequan/vlfeat,WangDequan/vlfeat,rxl194/vlfeat,erexhepa/vlfeat,richarddzh/vlfeat,mylxiaoyi/vlfeat,WangDequan/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,cvfish/vlfeat,j-bo/vlfeat,cvfish/vlfeat,cvfish/vlfeat,vlfeat/vlfeat,richarddzh/vlfeat,j-bo/vlfeat,qubick/vlfeat,CansenJIANG/vlfeat,erexhepa/vlfeat,hongzhili/vlfeat