Changed MDF compression to use ROOT ZLIB instead of the default (@clemenci)

In ROOT 6.14 the default changed from ZLIB to LZ4, and this change ensures reproducibility across versions of ROOT.

Cherry picked from !1380 (merged) on master

• [2018-06-15 00:07] Validation started with lhcb-run2-patches#46
• [2018-06-16 00:08] Validation started with lhcb-run2-patches#47

Does not compile in run2-patches:

DAQ/MDF/src/RawEventHelpers.cpp:54:17: error: conflicting declaration of C function 'void R__zip(int, int*, const char*, int*, char*, int*)'
 extern "C" void R__zip (int cxlevel, int *nin, const char *bufin, int *lout, char *bufout, int *nout);
                 ^~~~~~
In file included from DAQ/MDF/src/RawEventHelpers.cpp:46:0:
/cvmfs/lhcb.cern.ch/lib/lcg/releases/ROOT/6.12.06-0f687/x86_64-slc6-gcc62-opt/include/RZip.h:30:17: note: previous declaration 'void R__zip(int, int*, char*, int*, char*, int*)'
 extern "C" void R__zip(int cxlevel, int *srcsize, char *src, int *tgtsize, char *tgt, int *irep);
                 ^~~~~~
DAQ/MDF/src/RawEventHelpers.cpp:55:17: error: conflicting declaration of C function 'void R__unzip(int*, const char*, int*, char*, int*)'
 extern "C" void R__unzip(int *nin, const char *bufin, int *lout, char *bufout, int *nout);
                 ^~~~~~~~
In file included from DAQ/MDF/src/RawEventHelpers.cpp:46:0:
/cvmfs/lhcb.cern.ch/lib/lcg/releases/ROOT/6.12.06-0f687/x86_64-slc6-gcc62-opt/include/RZip.h:32:17: note: previous declaration 'void R__unzip(int*, unsigned char*, int*, unsigned char*, int*)'
 extern "C" void R__unzip(int *srcsize, unsigned char *src, int *tgtsize, unsigned char *tgt, int *irep);

See full build log at https://lhcb-nightlies.cern.ch/logs/build/nightly/lhcb-run2-patches/46/x86_64-slc6-gcc62-opt/LHCb/

assigned to @clemenci

marked as a Work In Progress

changed the description

added 1 commit

• 91d7e4f1 - Removed redundant declarations.

Compare with previous version

Fixed

unmarked as a Work In Progress

merged

mentioned in commit f0e39f0b