[libadwaita/alatiera/readme] readme: Remove outdated build instructions

[Jordan Petridis <jpetridis src gnome org>]

commit 367c8c7eaea2274ea066680e6a88c22ea6570d41
Author: Jordan Petridis <jpetridis gnome org>
Date:   Tue Apr 6 16:07:18 2021 +0000

    readme: Remove outdated build instructions
    
    leftover from 83f795e5764a737cc88bd7603e76bb392f016cc1

 README.md | 10 ----------
 1 file changed, 10 deletions(-)
---
diff --git a/README.md b/README.md
index e49323d..7e743ea 100644
--- a/README.md
+++ b/README.md
@@ -9,16 +9,6 @@ using GTK/GNOME.
 
 libadwaita is licensed under the LGPL-2.1+.
 
-## Build dependencies
-
-To build libadwaita you need to first install the build-deps defined by [the debian/control 
file](https://gitlab.gnome.org/GNOME/libadwaita/blob/master/debian/control#L6).
-
-If you are running a Debian based distribution, you can easily install all those the dependencies making use 
of the following command
-
-```sh
-sudo apt-get build-dep .
-```
-
 ## Building
 
 We use the Meson (and thereby Ninja) build system for libadwaita. The quickest