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
Add test case to cover version.c.
Print debug/version level instead of __anonymous in error messages.

When integer debug/version levels are used, ident is not defined,
causing Dsymbol::toChars() to print "__anonymous", which is unhelpful.
Instead, it should return the debug/version level being set as an
integer.
Merge pull request #4171 from quickfur/issue13786_version

Issue 13786: Add test case to cover version.c.
fix Issue 13200 - Assertion `protName' failed

Set `parent`, `protection`, `isdeprecated`, and `userAttribDecl` members of `EnumDeclaration` as same as class and struct declarations, even if its definition is opaque.
fix Issue 13788 - dmd segfault, pragma(mangle) and a mixin
Unlisted bug fix: correct sc->pop() timing
[Refactoring] Improve code flow for error handling
[Refactoring] Remove ScopeStatement that is hard to notice

Conflicts:
	src/expression.c
[Refactoring] Increase locality of variables
fix Issue 13787 - Error without line number when slicing function pointer
[Refactoring] Fix incorrect wording 'arg' 'argument' for Parameter objects

An exception is the around of TypeTuple. It stores types and expressions
merely using Parameter. So the wording 'arg' is not incorrect at least.
Merge pull request #4182 from 9rnsr/refactor_parameter

[Refactoring] Fix incorrect wording 'arg' 'argument' for Parameter objects
Merge pull request #4181 from 9rnsr/fix13787

Issue 13787 - Error without line number when slicing function pointer
Merge pull request #4180 from 9rnsr/fix13788

Issue 13788 - dmd segfault, pragma(mangle) and a mixin
Merge pull request #4179 from 9rnsr/fix13200

Issue 13200 - Assertion `protName' failed
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