test: avoid feature test warning for GCC
test: avoid feature test warning for GCC

bbyykk/libtaigi,yan12125/libchewing,yan12125/libchewing,PingNote/libchewing,mangokingTW/libchewing,robert501128/libchewing,bbyykk/libtaigi,robert501128/libchewing,cwlin/libchewing,simonfork/libchewing,Chocobo1/libchewing,cwlin/libchewing,simonfork/libchewing,PeterDaveHello/libchewing,robert501128/libchewing,mangokingTW/libchewing,chewing/libchewing,PingNote/libchewing,mangokingTW/libchewing,czchen/libchewing,bbyykk/libtaigi,ShengYenPeng/libchewing,hiunnhue/libchewing,Chocobo1/libchewing,czchen/libchewing,chewing/libchewing,dimotsai/libchewing,dimotsai/libchewing,czchen/libchewing,czchen/libchewing,Chocobo1/libchewing,hiunnhue/libchewing,ShengYenPeng/libchewing,dimotsai/libchewing,kito-cheng/libchewing,chewing/libchewing,ShengYenPeng/libchewing,kito-cheng/libchewing,cwlin/libchewing,cwlin/libchewing,PeterDaveHello/libchewing,yan12125/libchewing,cwlin/libchewing,hiunnhue/libchewing,kito-cheng/libchewing,robert501128/libchewing,PingNote/libchewing,mangokingTW/libchewing,bbyykk/libtaigi,hiunnhue/libchewing,Chocobo1/libchewing,hiunnhue/libchewing,dimotsai/libchewing,ShengYenPeng/libchewing,yan12125/libchewing,PingNote/libchewing,PeterDaveHello/libchewing,simonfork/libchewing,chewing/libchewing,simonfork/libchewing,PeterDaveHello/libchewing,Chocobo1/libchewing,kito-cheng/libchewing,bbyykk/libtaigi