Lcg 81b aarch64

Merge request for 81b aarch64 build to sft/lcgcmake arm_tests branch. Main changes: updating config.guess scripts before building package. heptools-81b.cmake toolchain has Aarch64 catches. Various adjustments to CMakeLists.txt files, shouldn't interfere if not Aarch64. Some patches introduced: GPerftools, mysql (maybe some others?) Building qt4.8.6 instead of 4.8.4 Skipping over gridexternals

cmake/modules/ExternalProject.cmake

@@ -578,6 +578,11 @@ if(NOT rv EQUAL 0)
message(FATAL_ERROR \"error: extract of '\${filename}' failed\")
endif()
+# Update the config.guess files.
+#
+message(STATUS \"Updating the config.guess file...\")
+execute_process(COMMAND ${CMAKE_SOURCE_DIR}/cmake/modules/update.ConfigGuess)
+
# Analyze what came out of the tar file:
#
message(STATUS \"extracting... [analysis]\")