Support for platforms openbsd and freebsd x64 LE

[vtamara]

From an OpenBSD/adJ 7.5 that runs node v18.19.1 running

doas npm install -g @bufbuild/buf

Produces

npm ERR! code 1                                                                                                                                                 
npm ERR! path /usr/local/lib/node_modules/@bufbuild/buf
npm ERR! command failed                                                         
npm ERR! command sh -c node ./install.js                                        
npm ERR! /usr/local/lib/node_modules/@bufbuild/buf/install.js:52                
npm ERR!     throw new Error(`Unsupported platform: ${platformKey}`);           
npm ERR!           ^                                                            
npm ERR!                                                                                                                                                        
npm ERR! Error: Unsupported platform: openbsd x64 LE                                                                                                            
npm ERR!     at pkgAndSubpathForCurrentPlatform (/usr/local/lib/node_modules/@bufbuild/buf/install.js:52:11)
npm ERR!     at checkAndPreparePackage (/usr/local/lib/node_modules/@bufbuild/buf/install.js:94:28)
npm ERR!     at checkAllBinaries (/usr/local/lib/node_modules/@bufbuild/buf/install.js:115:30)                                                                  
npm ERR!     at Object.<anonymous> (/usr/local/lib/node_modules/@bufbuild/buf/install.js:162:1)
npm ERR!     at Module._compile (node:internal/modules/cjs/loader:1356:14)
npm ERR!     at Module._extensions..js (node:internal/modules/cjs/loader:1414:10)                                                                               
npm ERR!     at Module.load (node:internal/modules/cjs/loader:1197:32)                                                                                          
npm ERR!     at Module._load (node:internal/modules/cjs/loader:1013:12)
npm ERR!     at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:128:12)                                                             
npm ERR!     at node:internal/main/run_main_module:28:49                        
npm ERR!                                
npm ERR! Node.js v18.19.1                                                                                                                                       
                                                                                
npm ERR! A complete log of this run can be found in: /root/.npm/_logs/2024-06-04T19_36_10_559Z-debug-0.log