support macos

Author: aminya

build.js

@@ -18,6 +18,10 @@ const targets = ['src/processor/minidump_stackwalk', 'src/processor/minidump_dum
 if (process.platform === 'linux') {
   targets.push('src/tools/linux/dump_syms/dump_syms')
 }
+if (process.platform === 'darwin') {
+  targets.push('src/tools/mac/dump_syms/dump_syms')
+}
+
 spawnSync('make', ['-C', buildDir, '-j', require('os').cpus().length, ...targets], {
   stdio: 'inherit'
 })