GIT-INFO.md: remove version requirements

Keep them in docs/INTERNALS.md

Bump lowest perl to 5.8

Closes #14112

GIT-INFO.md

@@ -27,16 +27,6 @@ In environments that don't support configure (i.e. Windows), do this:
 
 ## REQUIREMENTS
 
-For `autoreconf` and `configure` (not `buildconf.bat`) to work, you need the
-following software installed:
+See [docs/INTERNALS.md][0] for requirement details.
 
- o autoconf 2.57  (or later)
- o automake 1.7   (or later)
- o libtool  1.4.2 (or later)
- o GNU m4 (required by autoconf)
- o perl
-
-If you don't have perl and don't want to install it, you can rename the source
-file `src/tool_hugehelp.c.cvs` to `src/tool_hugehelp.c` and avoid having to
-generate this file. This will give you a stubbed version of the file that
-doesn't contain actual content.
+[0]: docs/INTERNALS.md

docs/INTERNALS.md

@@ -47,7 +47,7 @@ versions of libs and build tools.
  - GNU Autoconf 2.59
  - GNU Automake 1.7
  - GNU M4       1.4
- - perl         5.6
+ - perl         5.8
  - roffit       0.5
  - cmake        3.7