doc: add loong64 info into platform list

PR-URL: #50086
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

BUILDING.md

@@ -110,6 +110,7 @@ platforms. This is true regardless of entries in the table below.
 | GNU/Linux        | armv6            | kernel >= 4.14, glibc >= 2.24     | Experimental                                    | Downgraded as of Node.js 12          |
 | GNU/Linux        | ppc64le >=power8 | kernel >= 4.18[^1], glibc >= 2.28 | Tier 2                                          | e.g. Ubuntu 20.04, RHEL 8            |
 | GNU/Linux        | s390x            | kernel >= 4.18[^1], glibc >= 2.28 | Tier 2                                          | e.g. RHEL 8                          |
+| GNU/Linux        | loong64          | kernel >= 5.19, glibc >= 2.36     | Experimental                                    |                                      |
 | Windows          | x64, x86 (WoW64) | >= Windows 10/Server 2016         | Tier 1                                          | [^2],[^3]                            |
 | Windows          | x86 (native)     | >= Windows 10/Server 2016         | Tier 1 (running) / Experimental (compiling)[^4] |                                      |
 | Windows          | x64, x86         | Windows 8.1/Server 2012           | Experimental                                    |                                      |