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)
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