K-9 Mail: Disable failing builds and add explanation

metadata/com.fsck.k9.txt

@@ -9,6 +9,9 @@ Changelog:https://github.com/k9mail/k-9/wiki/ReleaseNotes
 Auto Name:K-9 Mail
 Summary:Full-featured email client
 Description:
+'''Warning:''' Version 5.09+ introduce unchecked binaries which we hope to
+compile from source in the future.
+
 E-mail client supporting multiple accounts, POP3, IMAP and Push IMAP. Can do
 encryption if [[org.thialfihar.android.apg]] and/or
 [[org.sufficientlysecure.keychain]] is installed -- depending on the version.
@@ -175,6 +178,7 @@ Build:5.008,22008
         popd
 
 Build:5.009,22009
+    disable=binaries
     commit=5.009
     gradle=yes
     srclibs=Jutf7@20
@@ -185,6 +189,7 @@ Build:5.009,22009
         popd
 
 Build:5.010,22010
+    disable=binaries
     commit=5.010
     gradle=yes
     srclibs=Jutf7@20
@@ -193,6 +198,7 @@ Build:5.010,22010
         pushd $$Jutf7$$ && \
         $$MVN3$$ install && \
         popd
+    scanignore=plugins/SafeContentResolver/*
 
 Maintainer Notes:
 * Force targetSdk via gradle, to avoid erroneous call_log