omerc: catch invalid value of gamma (when specified without alpha) #3750
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Fixes OSGeo#3749 From the maths of the computation of alpha from gamma, there is a limitation where the maximum (absolute) value of gamma should be roughly less than 90° - |lat_0| New error message: ``` $ bin/proj -I +proj=omerc +lat_0=10 +lonc=10 +gamma=81 proj_create: Error 1027 (Invalid value for an argument): omerc: Invalid value for gamma: given lat_0 value, |gamma| should be <= 80.031869° Rel. 9.3.0, September 1st, 2023 <proj>: projection initialization failure cause: Invalid value for an argument program abnormally terminated ```
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Fixes #3749
From the maths of the computation of alpha from gamma, there is a limitation where the maximum (absolute) value of gamma should be roughly less than 90° - |lat_0|
New error message: