Fix prebuild#76, armv6 detection

Signed-off-by: paulober <[email protected]>

node-gyp-build.js

@@ -13,7 +13,8 @@ var runtime = isElectron() ? 'electron' : (isNwjs() ? 'node-webkit' : 'node')
 var arch = process.env.npm_config_arch || os.arch()
 var platform = process.env.npm_config_platform || os.platform()
 var libc = process.env.LIBC || (isAlpine(platform) ? 'musl' : 'glibc')
-var armv = process.env.ARM_VERSION || (arch === 'arm64' ? '8' : vars.arm_version) || ''
+// ARMv7 detection patched to avoid arm_version === "default" on other arm systems than arm64 ones
+var armv = process.env.ARM_VERSION || (arch === 'arm64' ? '8' : (arch === 'arm' ? (vars.arm_version === 'default' ? '7' : vars.arm_version) : '')) || ''
 var uv = (process.versions.uv || '').split('.')[0]
 
 module.exports = load