add GOTO2 and clean a bit the cmake macros

bench/btl/cmake/FindGOTO2.cmake

@@ -0,0 +1,25 @@
+
+if (GOTO2_LIBRARIES)
+  set(GOTO2_FIND_QUIETLY TRUE)
+endif (GOTO2_LIBRARIES)
+# 
+# find_path(GOTO_INCLUDES
+#   NAMES
+#   cblas.h
+#   PATHS
+#   $ENV{GOTODIR}/include
+#   ${INCLUDE_INSTALL_DIR}
+# )
+
+find_file(GOTO2_LIBRARIES libgoto2.so PATHS /usr/lib $ENV{GOTO2DIR} ${LIB_INSTALL_DIR})
+find_library(GOTO2_LIBRARIES goto2 PATHS $ENV{GOTO2DIR} ${LIB_INSTALL_DIR})
+
+if(GOTO2_LIBRARIES AND CMAKE_COMPILER_IS_GNUCXX)
+  set(GOTO2_LIBRARIES ${GOTO2_LIBRARIES} "-lpthread -lgfortran")
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GOTO2 DEFAULT_MSG
+                                  GOTO2_LIBRARIES)
+
+mark_as_advanced(GOTO2_LIBRARIES)