Gmsh example updated for the latest Gmsh and Specfem2D #114

Job	Run time
Check file changes	21s
Test on Mac	5m 4s
Test on ubuntu-latest	1m 32s
Test Intel on ubuntu-20.04	5m 18s
Test on ubuntu-20.04	1m 33s
Test run example 1 - benchmark claerbout kernel acoustic	2m 18s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 11s
Test run example 0 - make tests	3m 37s
Test run example 11 - tomographic_ocean_model	1m 28s
Test run example 11 - Marmousi2	2m 44s
Test run example 2 - benchmark claerbout kernel elastic P-SV	2m 44s
Test run example 3 - benchmark claerbout kernel elastic SH	2m 46s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	3m 2s
Test run example 5 - moving sources	2m 29s
Test run example 6 - anisotropy	1m 57s
Test run example 7 - Industrial_Format_SEP	6m 37s
Test run example 8 - axisymmetric_case_AXISYM_option	2m 10s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 37s
	50m 28s

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