HADOOP-16856. cmake is missing in the CentOS 8 section of BUILDING.txt. (#1841)

BUILDING.txt

@@ -426,7 +426,7 @@ Building on CentOS 8
 
 
 * Install development tools such as GCC, autotools, OpenJDK and Maven.
-  $ sudo dnf group install 'Development Tools'
+  $ sudo dnf group install --with-optional 'Development Tools'
   $ sudo dnf install java-1.8.0-openjdk-devel maven
 
 * Install Protocol Buffers v3.7.1.