CONFIG: improve support for compiler/link options (#1830)

- introduce WM_COMPILE_CONTROL variable to convey control information
  into the build rules.

  The convention (as per spack):
      - '+' to select a feature
      - '~' to deselect a feature

  Eg, to select the gold linker, and disable openmp
  (spaces are not required):

      WM_COMPILE_CONTROL="+gold ~openmp"

CONFIG: accept FOAM_EXTRA_LDFLAGS for AMD, gold, Mingw linkers

CONFIG: generalize PROJECT_LIBS (-ldl used almost universally)

applications/utilities/postProcessing/miscellaneous/profilingSummary/Make/options

@@ -1,3 +1,2 @@
-EXE_INC =
-
-EXE_LIBS =
+/* EXE_INC = */
+/* EXE_LIBS = */