HADOOP-16856. cmake is missing in the CentOS 8 section of BUILDING.txt.

[iwasakims]

No description provided.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 13s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ trunk Compile Tests _
+1 💚	shadedclient	15m 32s	branch has no errors when building and testing our client artifacts.
		_ Patch Compile Tests _
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedclient	15m 16s	patch has no errors when building and testing our client artifacts.
		_ Other Tests _
+1 💚	asflicense	0m 30s	The patch does not generate ASF License warnings.
		34m 10s

Subsystem	Report/Notes
Docker	Client=19.03.5 Server=19.03.5 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1841/1/artifact/out/Dockerfile
GITHUB PR	#1841
Optional Tests	dupname asflicense
uname	Linux de1a3a77d24b 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 9709afe
Max. process+thread count	305 (vs. ulimit of 5500)
modules	C: . U: .
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1841/1/console
versions	git=2.7.4 maven=3.3.9
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[aajisaka]

+1, thank you @iwasakims