Fix omp reproducible

[JanStreffing]

Turning on the -DOPENMP_REPRODUCIBLE=ON flag results in many compiler errors with gcc 13 on levante.
Here are all the changes necessary to compile again.

[JanStreffing]

Currently running tests with 4 threads to see if we really are bit-reproducible.

[JanStreffing]

While this compiles with -DOPENMP_REPRODUCIBLE=ON it blows up in step 1. Even when only one thread is used:

118:  ___CHECK FOR BLOW UP___________ --> mstep=           1
118:   --STOP--> found eta_n become NaN or <-10.0, >10.0
118:  mype     =          118
118:  mstep    =            1
118:  node     =          912
118:  uln, nln    =            1          30
118:  glon,glat   =   -12.7394000000000        51.2200000000000
118:
118:  eta_n(n)    =    11.6688147357911
118:  d_eta(n)    =  -3.529929058722991E-002
118:
118:  zbar_3d_n   =    11.6688147357909        6.62991868667159        1.59102263755229       -8.48676946068632       -18.5645615589249       -28.6423536571635       -38.7201457554021       -48.7979378536407       -58.8757299518794       -68.9535220501180       -79.0313141483566       -89.1091062465952       -104.225794393953       -124.381378590430       -149.575858836027       -179.809235130743       -220.120403523697       -270.509364014890       -330.976116604322       -401.520661291992       -482.142998077901       -572.843126962048       -673.621047944434       -784.476761025059       -905.410266203922       -1036.42156348102       -1177.51065285636       -1328.67753432994       -1500.00000000000       -1810.00000000000       0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000  0.000000000000000E+000

Using -DOPENMP_REPRODUCIBLE=OFF we can run with and without OMP threads and get no crashes.