Update expected output; fewer files in source-code FMU

Belonging to [master]:
  - #125
  - OpenModelica/OMCompiler#3036

Author: sjoelund

testsuite/openmodelica/fmi/ModelExchange/2.0/testBug2764.mos

@@ -91,7 +91,6 @@ readFile("modelDescription.tmp.xml");
 //       <File name=\"./util/ModelicaUtilities.c\" />
 //       <File name=\"./util/omc_msvc.c\" />
 //       <File name=\"./util/simulation_options.c\" />
-//       <File name=\"./util/cJSON.c\" />
 //       <File name=\"./util/rational.c\" />
 //       <File name=\"./util/modelica_string_lit.c\" />
 //       <File name=\"./util/omc_init.c\" />

testsuite/openmodelica/fmi/ModelExchange/2.0/testBug3049.mos

@@ -82,7 +82,6 @@ readFile("modelDescription.tmp.xml");
 //       <File name=\"./util/ModelicaUtilities.c\" />
 //       <File name=\"./util/omc_msvc.c\" />
 //       <File name=\"./util/simulation_options.c\" />
-//       <File name=\"./util/cJSON.c\" />
 //       <File name=\"./util/rational.c\" />
 //       <File name=\"./util/modelica_string_lit.c\" />
 //       <File name=\"./util/omc_init.c\" />

testsuite/openmodelica/fmi/ModelExchange/2.0/testDisableDep.mos

@@ -96,7 +96,6 @@ readFile("modelDescription.tmp.xml");
 //       <File name=\"./util/ModelicaUtilities.c\" />
 //       <File name=\"./util/omc_msvc.c\" />
 //       <File name=\"./util/simulation_options.c\" />
-//       <File name=\"./util/cJSON.c\" />
 //       <File name=\"./util/rational.c\" />
 //       <File name=\"./util/modelica_string_lit.c\" />
 //       <File name=\"./util/omc_init.c\" />

testsuite/openmodelica/fmi/ModelExchange/2.0/testDiscreteStructe.mos

@@ -93,7 +93,6 @@ readFile("modelDescription.tmp.xml");
 //       <File name=\"./util/ModelicaUtilities.c\" />
 //       <File name=\"./util/omc_msvc.c\" />
 //       <File name=\"./util/simulation_options.c\" />
-//       <File name=\"./util/cJSON.c\" />
 //       <File name=\"./util/rational.c\" />
 //       <File name=\"./util/modelica_string_lit.c\" />
 //       <File name=\"./util/omc_init.c\" />