Disable Fortran and Ipopt for the nightly build. (#9852)

  - The nightly build creates nightly packages. For now, disable Fortran
    on it so that it produces a package with out difficult-to-setup dependencies
    while providing all the normal functionalities of OpenModelica.

.CI/cmake/Jenkinsfile.cmake.macos.gcc

@@ -41,7 +41,11 @@ pipeline {
                                           // Always specify the compilers explicilty for macOS
                                           + " -DCMAKE_C_COMPILER=gcc"
                                           + " -DCMAKE_CXX_COMPILER=g++"
-                                          + " -DCMAKE_Fortran_COMPILER=gfortran"
+                                          // Disable fortran (and ipopt) for this build because
+                                          // we build a pkg from it and we do not want to depend
+                                          // on Fortran for now.
+                                          + " -DOM_OMC_ENABLE_FORTRAN=OFF"
+                                          + " -DOM_OMC_ENABLE_IPOPT=OFF"
                                       )
                 sh "build/bin/omc --version"
                 // Create a product build package