Arch Linux

Description:
After update or fresh install of the yarn package, its binaries do not have +x flag

Additional info:
yarn-0.24.3-1

Steps to reproduce:
```
[dantix@enceladus ~]$ sudo pacman -S yarn
resolving dependencies...
looking for conflicting packages...

Packages (1) yarn-0.24.3-1

Total Installed Size: 3.49 MiB

:: Proceed with installation? [Y/n]
(1/1) checking keys in keyring [########################################################################] 100%
(1/1) checking package integrity [########################################################################] 100%
(1/1) loading package files [########################################################################] 100%
(1/1) checking for file conflicts [########################################################################] 100%
(1/1) checking available disk space [########################################################################] 100%
:: Processing package changes...
(1/1) installing yarn [########################################################################] 100%
:: Running post-transaction hooks...
(1/1) Arming ConditionNeedsUpdate...
[dantix@enceladus ~]$ yarn
bash: /usr/bin/yarn: Permission denied
[dantix@enceladus ~]$ which yarn
which: no yarn in (/home/dantix/.npm-packages/bin:/opt/android-sdk/tools:/home/dantix/bin:/home/dantix/.gem/ruby/2.2.0/bin:/home/dantix/bin:/usr/local/bin:/home/dantix/.npm-packages/bin:/opt/android-sdk/tools:/home/dantix/bin:/home/dantix/.gem/ruby/2.2.0/bin:/home/dantix/bin:/usr/local/bin:/home/dantix/.npm-packages/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)
[dantix@enceladus ~]$ ls -lash /usr/lib/node_modules/yarn/bin/yarn.js
4.0K -rw-r--r-- 1 root root 177 May 15 18:29 /usr/lib/node_modules/yarn/bin/yarn.js
```