os_support: fix misleading comments
os_support: fix misleading comments

maolin-cdzl/speexdsp,ksophocleous/speexdsp,maolin-cdzl/speexdsp,felipebetancur/speexdsp,ksophocleous/speexdsp,maolin-cdzl/speexdsp,maolin-cdzl/speexdsp,felipebetancur/speexdsp,felipebetancur/speexdsp,felipebetancur/speexdsp,ksophocleous/speexdsp,ksophocleous/speexdsp