configure: bump to 1.2rc2
configure: bump to 1.2rc2

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