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Remove memory leak from epicsEnvSet() on systems that support setenv()

Heinz Junkes requested to merge github/fork/hdante/fix-envset-leak into 3.16

Created by: hdante

Example valgrind log showing memory leak, fixed by this patch:

==11103== 22 bytes in 1 blocks are definitely lost in loss record 39 of 745
==11103==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11103==    by 0x555886E: mallocMustSucceed (cantProceed.c:43)
==11103==    by 0x5562082: epicsEnvSet (osdEnv.c:39)
==11103==    by 0x52F4347: iocshRegisterCommon (iocshRegisterCommon.c:40)
==11103==    by 0x409462: Registration (ScalerLinux_registerRecordDeviceDriver.cpp:296)
==11103==    by 0x409462: __static_initialization_and_destruction_0 (ScalerLinux_registerRecordDeviceDriver.cpp:301)
==11103==    by 0x409462: _GLOBAL__sub_I_ScalerLinux_registerRecordDeviceDriver (ScalerLinux_registerRecordDeviceDriver.cpp:301)
==11103==    by 0x41123C: __libc_csu_init (in /home/ABTLUS/henrique.almeida/code/ScalerLinux/bin/linux-x86_64/ScalerLinux)
==11103==    by 0x617A7BE: (below main) (libc-start.c:247)

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