Updating submodules

* OMCompiler 76801fe...5608b79 (5):
  > Update README.Linux.md
  > Update README.Linux.md
  > Change the Linux readme to markdown
  > Pass CFLAGS/CXXFLAGS to ipopt
  > - visualization xml stores equations for protected, time-dependent variables

* libraries 48c206c...3f8a105 (1):
  > Bump libraries - https://github.com/lbl-srg/modelica-buildings.git branch master updated to ae270dab831b4b168da527cd423e01528e87a4ab.   * [lbl-srg/modelica-buildings@ae270da ae270da] Merge pull request #416 from lbl-srg/issue_415   * [lbl-srg/modelica-buildings@9a2d1c6 9a2d1c6] Revised info sections for the models modified, run unit test.   * [lbl-srg/modelica-buildings@4c1c61d 4c1c61d] Tentative to fix issue #415. Adding a dummy interface for resistive models actualli helps Openmodelica to parse them.

* testsuite 2c1535d...ded2952 (2):
  > Skip LOG_IPOPT_ERROR as the numbers are not interesting
  > Print less output to pass the testsuite