Revert "hurd: Fix mach installed headers test"

This reverts commit d4379e0216: the proper
headers are actually already getting installed.

ChangeLog

@@ -103,15 +103,11 @@
 2018-04-18  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* conform/data/sys/un.h-data: Allow sun_ prefix.
-	* sysdeps/mach/include/lock-intern.h: Move to include/.
-	* sysdeps/mach/include/mach.h: Move to include/.
-	* sysdeps/mach/include/mach/mig_support.h: Move to include/mach/.
-	* sysdeps/mach/include/mach_error.h: Move to include/.
-	* include/lock-intern.h [!_ISOMAC]: Do not declare libc hidden
+	* sysdeps/mach/include/lock-intern.h: Do not declare libc hidden
 	prototypes.
-	* include/mach.h [!_ISOMAC]: Likewise.
-	* include/mach/mig_support.h [!_ISOMAC]: Likewise.
-	* include/mach_error.h [!_ISOMAC]: Likewise.
+	* sysdeps/mach/include/mach.h: Likewise.
+	* sysdeps/mach/include/mach/mig_support.h: Likewise.
+	* sysdeps/mach/include/mach_error.h: Likewise.
 
 2018-04-16  Adhemerval Zanella  <adhemerval.zanella@linaro.org>