Missing units in the relocatable Library_Interface attribute definition

[dsauvage]

The units below are missing in the relocatable Library_Interface attribute definition

GPR2.Build.Jobserver_Protocol.Pipe
GPR_Parser.Private_Converters
GPR2.Build.View_Tables.Update_Sources_List
GPR2.Tree_Internal.Load_Autoconf

Above fix is for instance required to successfully build libadalang (26.0.0), which depends on gpr2 (26.0..0)

[Jicquel]

Hello @dsauvage, thank you for this report! Would you like to open a PR ?

[dsauvage]

Sure,
#16