Add CMSSW_7_3_DEVEL_X IB.
Remove CMSSW_7_2_DEVEL_X.
Update root to include global functions list lock and clang fix.

See also cms-sw/root#31 and cms-sw/root#30.
Merge pull request #1082 from degano/root_fixes_72XStable

Update root to include global functions list lock and clang fix.
Merge remote branch 'origin/IB/CMSSW_7_0_X/stable' into IB/CMSSW_7_0_X/stable
Merge remote branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable
Merge remote branch 'origin/IB/CMSSW_7_2_X/stable' into IB/CMSSW_7_0_X/stable
updated config tag to V05-03-23
Merge pull request #1086 from smuzaffar/IB/CMSSW_7_3_X/stable

updated config tag to V05-03-23
gcc-toolfile: select correct linker (ld) flags based on architecture

Darwin/OSX only needs '-r' for incremental linking. '-m' is deprecated.
'-z muldefs' only needs to be applied on GNU linkers, not for Darwin/OSX.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge pull request #1087 from davidlt/ld_unit_gcc-toolfile

gcc-toolfile: select correct linker (ld) flags based on architecture
updated config tag to V05-03-24
Merge pull request #1088 from smuzaffar/IB/CMSSW_7_3_X/stable

updated config tag to V05-03-24
Merge remote branch 'origin/IB/CMSSW_7_3_X/stable' into IB/CMSSW_7_0_X/stable