[Gmsh] building of gmsh on mingw64

[walter]

I am sorry, I made a mistake. The correct patch to find OCC libraries on MINGW64 should be:



 line 12179 to 1273
        if(ENABLE_OCC_STATIC)
          set(LIBNAME lib${OCC}.a)
        else()
          set(LIBNAME ${OCC})
        endif()

 is replaced by:        
        if(ENABLE_OCC_STATIC)
          if(MINGW)
             set(LIBNAME lib${OCC}.dll.a)
          else()
             set(LIBNAME lib${OCC}.a)
          endif()
        else()
          set(LIBNAME ${OCC})
        endif()


 line 1284 to 1285:        
        find_library(OCC_LIB ${LIBNAME} HINTS ENV CASROOT PATH_SUFFIXES
                     lib ${OCC_SYS_NAME}/lib ${OCC_SYS_NAME}/vc8/lib)

 replaced by:
        find_library(OCC_LIB ${LIBNAME} HINTS ENV CASROOT PATH_SUFFIXES
                     lib ${OCC_SYS_NAME}/lib ${OCC_SYS_NAME}/vc8/lib ${OCC_SYS_NAME}/gcc/lib ${OCC_SYS_NAME}/gcc/bin)

 line 1306 to 1307:  
        find_library(OCC_CAF_LIB ${OCC} HINTS ENV CASROOT PATH_SUFFIXES
                    lib ${OCC_SYS_NAME}/lib ${OCC_SYS_NAME}/vc8/lib)

 replaced by:       
        find_library(OCC_CAF_LIB ${OCC} HINTS ENV CASROOT PATH_SUFFIXES
                     lib ${OCC_SYS_NAME}/lib ${OCC_SYS_NAME}/vc8/lib ${OCC_SYS_NAME}/gcc/lib ${OCC_SYS_NAME}/gcc/bin)