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Enable kernel module versioning - Rev2

Keith Thorne requested to merge keith-thorne/advligorts:branch-MODVERSIONS_rev2 into master

Closes #14 (closed) - Restore support for kernel module versioning
( requires update to mbuf,gpstime DKMS package )

patches/kernel-4.19-cs/config-4.19.67-cs - change to MODVERSIONS=y
patches/kernel-4.19-cs/README - Update note on config file\

-- changes for mbuf, gpstime symbol versions --
Update RCG autotools - remove configure, move configure.in to configure.ac
bootstrap - add to generate configure from configure.ac
configure.ac - rename from configure.in, add tests to find path to mbuf, gpstime
Module.symvers files - either /var/lib/dkms/MODNAME/MODVERS/KVERS/ARCH
for DKMS package or /var/cache/$MODNAME from local build
src/drv/ExtraSymbols.symvers - Remove mbuf, gpstime symbols
src/drv/gpstime/Makefile - Add caching of Module.symvers in /var/cache/gpstime on install
src/drv/mbuf/Makefile - Add caching of Module.symvers in /var/cache/mbuf on install
src/epics/util/Makefile.in - Add mbuf,gpstime Module.symvers paths
src/epics/util/feCodeGen.pl - Add KBUILD_EXTRA_SYMBOLS statements to front-end make file

-- changes to front-end kernel module symbol versions --
src/drv/ExtraSymbols.symvers - Remove need_to_load_IOP_first
src/epics/util/Makefile.in - Add caching of need_to_load_IOP_first symbol version, copy of cache for builds
src/epics/util/feCodeGen.pl - Add KBUILD_EXTRA_SYMBOLS for this

Edited by Keith Thorne

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