IVGCVSW-4487 Adds ghc::filesystem to third-party

 * as replacement for boost::filesystem
 * added to cmake
 * added to TPIP in readme.md

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: I0098e490e8597a9bae4781cacba8e19f8a50d1f0
diff --git a/cmake/GlobalConfig.cmake b/cmake/GlobalConfig.cmake
index 9cf825e..3e0f0fe 100644
--- a/cmake/GlobalConfig.cmake
+++ b/cmake/GlobalConfig.cmake
@@ -135,6 +135,10 @@
 find_path(CXXOPTS_INCLUDE cxxopts/cxxopts.hpp PATHS third-party)
 include_directories(SYSTEM "${CXXOPTS_INCLUDE}")
 
+# ghc (Alternative to boost::filesystem)
+find_path(GHC_INCLUDE ghc/filesystem.hpp PATHS third-party)
+include_directories(SYSTEM "${GHC_INCLUDE}")
+
 # pthread
 find_package (Threads)