added constants for GNU protection modes.
added constants for GNU protection modes.

open-keychain/spongycastle,lesstif/spongycastle,FAU-Inf2/spongycastle,isghe/bc-java,savichris/spongycastle,bcgit/bc-java,sonork/spongycastle,bcgit/bc-java,isghe/bc-java,open-keychain/spongycastle,sergeypayu/bc-java,open-keychain/spongycastle,FAU-Inf2/spongycastle,isghe/bc-java,Skywalker-11/spongycastle,savichris/spongycastle,lesstif/spongycastle,sonork/spongycastle,sonork/spongycastle,Skywalker-11/spongycastle,Skywalker-11/spongycastle,onessimofalconi/bc-java,lesstif/spongycastle,sergeypayu/bc-java,sergeypayu/bc-java,onessimofalconi/bc-java,onessimofalconi/bc-java,FAU-Inf2/spongycastle,savichris/spongycastle,bcgit/bc-java