(also added some more tabbing)

* mserv.c: added i_tcp.c's USE_WINSOCK macros so socklen_t isn't redundantly defined if Winsock 2 is used

i_tcp.c: SCOUW2 and SCOUW7 haven't been defined since we got rid of Doom Legacy's makefiles for UnixWare 2/7 (which are ANCIENT), so get rid of them!

added tabbing to some of the preprocessor code in i_tcp.c and mserv.c to make it easier to read them (and to allow me to understand what I need to do for the next commit)

(according to modern MinGW versions, defining this macro directly is deprecated)

I guess GCC isn't always "GCC"

See merge request !1057

Merge branch 'i-added-the-branch-name-into-the-version-command-when-outside-of-develop-mode' into 'master'

Adds the branch name into the version command printout when outside of DEVELOP mode.

See merge request !981

Detect GCC version in Makefile

See merge request !1002

2.2.6 preparation

See merge request STJr/SRB2!1050

Revert "Fix computation of very high pings"

See merge request !1053

This reverts commit 82dbe95e.

Fix GL y-shearing ignoring a Y-flipped transform

See merge request !1051

Marathon Run adjustments

See merge request !1048

Fix models that use sprite textures

See merge request !1049

Bruh Core Zone 2

See merge request !1047

Introduce a live event backup penalty for non MA_INGAME runs, since the change to saving time causes problems for this.

Hopefully fix the issue, which I can't recreate, of live event backups being created even if they shouldn't.

Add a small amount of extra info to the Evaluation screen for Marathon Mode, on request from multiple runners.

Fix the issue where custom exits with skipped intermission screens (notably, Black Core Zone 2 and 3) would cause the game to softlock when playing on a save file, or with a live event backup.

Restore SKINCOLOR_SUPERGOLD1-5 changes from 2.2.3

See merge request !1042

Fix custom skincolors being fullbright & signpost backgrounds using incorrect color shades

Closes #179 and #182

See merge request STJr/SRB2!1043

Whose idea was it to make the aPNG speed 1/2x by default?!

See merge request !1044

2.2.5 preparation

See merge request !1039