Add gcc 2.7.2 "970404" release

[mkst]

970404 => 04/04/1997. Check for relevant commits to the gcc git repo and build appropriate version.

[Xeeynamo]

What is this version about?

[mkst]

There are multiple psyq 2.7.2 versions: GNU C version 2.7.2.SN32.3.7.0002 [AL 1.1, MM 40] Sony Playstation compiled by CC. GNU C version cygnus-2.7.2-970404 SN32.3.7.0004 (SonyPSX) compiled by CC. This issue is to build the 1997/04/04 version, which is slightly different (I believe Rocket Robot On Wheels (n64) uses it.

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