Add Glibc predefined global version and insert all C runtimes into the list of predefined global versions
Get rid of the last usage of std.c, which has been moved to core.sys in druntime
Merge pull request #4111 from joakim-noah/add_glibc

Add predefined global version for Glibc
fix Issue 13802 - Improve pretty-print result for the const(string) type
fix Issue 13803 - Improve pretty-print result for the wstring an dstring types
Merge pull request #4185 from 9rnsr/fix_pp_string

Issue 13802 & 13803 - Improve pretty-print result for the three string types