[!215] Use dependency tracking provided by UseLatexMk.cmake

Merge branch 'use-latexmk-dependency-tracking' into 'master'

ref:staging/dune-functions dune-common switched to UseLatexMk.cmake, which
exploits the dependency tracking of latexmk. Let's use this for the
dune-functions manuals, because it allows to vastly shorten the CMakelists.txt
file.

See merge request [!215]

  [!215]: gitlab.dune-project.org/staging/dune-functions/merge_requests/215

doc/manual/CMakeLists.txt

 if(LATEX_USABLE)
 
-  set(BASES_SOURCES
-    ../../examples/interpolation.cc
-    ../../examples/stokes-taylorhood.cc
-  )
-
-  set(BASES_IMAGES
-    gfx/driven_cavity.pdf
-    gfx/driven_cavity_result.png
-    gfx/febasis_interface_schematic.pdf
-    gfx/cc-by-nd.pdf
-  )
-
-  dune_add_latex_document(dune-functions-bases.tex
-    BIBFILES dune-functions-bases.bib
-    INPUTS ${BASES_SOURCES}
-    IMAGES ${BASES_IMAGES})
-
-  set(FUNCTIONS_SOURCES
-    src/integration-test.cc
-    gfx/timings_gcc.pgf
-    gfx/timings_gcc_pgo.pgf
-    gfx/timings_clang.pgf
-  )
-
-  set(FUNCTIONS_IMAGES
-    gfx/functions_interface_schematic.pdf
-  )
-
-  dune_add_latex_document(dune-functions-functions.tex
-    BIBFILES dune-functions-functions.bib
-    INPUTS ${FUNCTIONS_SOURCES}
-    IMAGES ${FUNCTIONS_IMAGES})
+  add_latex_document(SOURCE dune-functions-bases.tex)
+  add_latex_document(SOURCE dune-functions-functions.tex)
 
 endif(LATEX_USABLE)