Revert "Revert "HDFS-15971. Make mkstemp cross platform (#2898)""

[GauthamBanasandra]

• This reverts commit
  aed13f0.
• Verified by building locally on Centos 7 that
  Hadoop builds fine with this PR.
• Build log -
  https://issues.apache.org/jira/secure/attachment/13025814/build-log.zip
  Reverted commit -
  https://issues.apache.org/jira/secure/attachment/13025815/commit-details.txt
  Dockerfile_centos_7 -
  https://issues.apache.org/jira/secure/attachment/13025816/Dockerfile_centos_7

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	13m 44s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 6 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	36m 31s		trunk passed
+1 💚	compile	2m 51s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	2m 54s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	mvnsite	0m 27s		trunk passed
+1 💚	shadedclient	58m 23s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 14s		the patch passed
+1 💚	compile	2m 43s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	cc	2m 43s		the patch passed
+1 💚	golang	2m 43s		the patch passed
+1 💚	javac	2m 43s		the patch passed
+1 💚	compile	2m 47s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	cc	2m 47s		the patch passed
+1 💚	golang	2m 47s		the patch passed
+1 💚	javac	2m 47s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 21s		the patch passed
+1 💚	shadedclient	15m 40s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	102m 44s		hadoop-hdfs-native-client in the patch passed.
+1 💚	asflicense	0m 30s		The patch does not generate ASF License warnings.
		199m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3044/1/artifact/out/Dockerfile
GITHUB PR	#3044
Optional Tests	dupname asflicense compile cc mvnsite javac unit codespell golang
uname	Linux 6a91a863a395 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 5ad00b6
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3044/1/testReport/
Max. process+thread count	586 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-native-client U: hadoop-hdfs-project/hadoop-hdfs-native-client
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3044/1/console
versions	git=2.25.1 maven=3.6.3
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