doc: Remove obsoleted information about CentOS build

spec files to build under CentOS are available in:
https://github.com/JacekDanecki/neo-specs/tree/master/specs/centos

Change-Id: I354e63416b9acfce12aed43925c4f2c769bf1b25
Signed-off-by: Jacek Danecki <jacek.danecki@intel.com>

Author: JacekDanecki

documentation/FAQ.md

@@ -14,12 +14,6 @@ Our default (most frequent) validation config is currently (as of Q4'18) Ubuntu
 
 Note: Neo will not work correctly on legacy kernels with Intel patches (e.g. 4.7.0.intel.r4.0).
 
-### What toolchain do you recommend for building NEO on CentOS?
-
-We recommend the following packages:
-* devtoolset-4-gcc-c++
-* llvm-toolset-7-clang
-
 ### Does NEO support Microsoft Windows?
 
 Our closed-source driver for Windows is using the same codebase. At this time,
@@ -156,4 +150,4 @@ Most of the developers are located in Poland (UTC+1 timezone).
 
 1. Go to: https://jobs.intel.com/ListJobs/All/Search/city/Gdansk/
 1. Filter for OpenCL in the job title
-1. Browse the descriptions looking for positions mentioning this GitHub repository
+1. Browse the descriptions looking for positions mentioning this GitHub repository