3744: Add gmock as dependency to README r=edg-l a=def-

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## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: def <dennis@felsin9.de>
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bors[bot] 2021-03-26 08:03:17 +00:00 committed by GitHub
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@ -30,11 +30,11 @@ Dependencies on Linux
You can install the required libraries on your system, `touch CMakeLists.txt` and CMake will use the system-wide libraries by default. You can install all required dependencies and CMake on Debian or Ubuntu like this:
sudo apt install build-essential cmake git libcurl4-openssl-dev libssl-dev libfreetype6-dev libglew-dev libnotify-dev libogg-dev libopus-dev libopusfile-dev libpnglite-dev libsdl2-dev libsqlite3-dev libwavpack-dev python
sudo apt install build-essential cmake git libcurl4-openssl-dev libssl-dev libfreetype6-dev libglew-dev libnotify-dev libogg-dev libopus-dev libopusfile-dev libpnglite-dev libsdl2-dev libsqlite3-dev libwavpack-dev python google-mock
Or on Arch Linux like this:
sudo pacman -S --needed base-devel cmake curl freetype2 git glew libnotify opusfile python sdl2 sqlite wavpack
sudo pacman -S --needed base-devel cmake curl freetype2 git glew libnotify opusfile python sdl2 sqlite wavpack gmock
There is an [AUR package for pnglite](https://aur.archlinux.org/packages/pnglite/). For instructions on installing it, see [AUR packages installation instructions on ArchWiki](https://wiki.archlinux.org/index.php/Arch_User_Repository#Installing_packages).