add fortran language explicitly to fortrantest

Author: galabovaa

check/CMakeLists.txt

@@ -3,6 +3,7 @@ include(CTest)
 if (FORTRAN AND NOT BUILD_EXTRA_UNIT_ONLY)
     set(CMAKE_Fortran_MODULE_DIRECTORY ${HIGHS_BINARY_DIR}/modules)
     add_executable(fortrantest TestFortranAPI.f90)
+    set_target_properties(fortrantest PROPERTIES LINKER_LANGUAGE Fortran)
     if (NOT FAST_BUILD)
         target_link_libraries(fortrantest libhighs FortranHighs)
     else()