[cmake,valgrind] Bring back mistakenly removed FindValgrind.cmake

The removal happend in 7b651d13

cmake/modules/CMakeLists.txt

@@ -4,6 +4,7 @@ set(modules
   DumuxDoxygen.cmake
   DumuxMacros.cmake
   DumuxTestMacros.cmake
-  FindGstat.cmake)
+  FindGstat.cmake
+  FindValgrind.cmake)
 include(GNUInstallDirs)
 install(FILES ${modules} DESTINATION ${DUNE_INSTALL_MODULEDIR})

cmake/modules/FindValgrind.cmake

+#
+# Module that checks whether Valgrind's header memcheck.h is present
+#
+# Variables used by this module which you may want to set:
+# VALGRIND_ROOT         Path list to search for memcheck.h
+#
+# Sets the follwing variable:
+#
+# Valgrind_FOUND          True if Valgrind was found
+# VALGRIND_INCLUDE_DIR    Path to Valgrind's include dirs.
+
+
+# look for header files, only at positions given by the user
+find_path(VALGRIND_INCLUDE_DIR
+  NAMES "valgrind/memcheck.h"
+  PATHS ${VALGRIND_ROOT}
+  PATH_SUFFIXES "include"
+  NO_DEFAULT_PATH
+)
+# look for header files, including default paths
+find_path(VALGRIND_INCLUDE_DIR
+  NAMES "valgrind/memcheck.h"
+  PATH_SUFFIXES "include"
+)
+
+# handle package arguments
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  "Valgrind"
+  DEFAULT_MSG
+  VALGRIND_INCLUDE_DIR
+)
+
+# set HAVE_VALGRIND for config.h
+set(HAVE_VALGRIND ${Valgrind_FOUND})
+
+# register all Valgrind related flags
+if(Valgrind_FOUND)
+  dune_register_package_flags(INCLUDE_DIRS "${VALGRIND_INCLUDE_DIR}")
+endif()