CONFIG: adjust intel compiler and mpi settings (#2056)

- largely as per patch from Jong-Gwan (Jason) Do

NB: the intel-one setup adds in paths for intelmpi.
    Its mpicc version does not harmonize with the OpenFOAM
    system openmpi setup (using mpicc --showme:link).

    Needs adjustment, or use intelmpi instead.

- update name mappings for newer gcc, clang versions

wmake/rules/General/Icx/c

@@ -0,0 +1,10 @@
+SUFFIXES += .c
+
+cc          = icx
+
+cARCH       =
+cDBUG       =
+cOPT        = -O2
+cWARN       = $(FOAM_EXTRA_CFLAGS)
+
+#------------------------------------------------------------------------------

wmake/rules/General/Icx/c++

@@ -0,0 +1,24 @@
+SUFFIXES += .C .cc .cpp .cxx
+
+CC          = icpx -std=c++11
+
+c++ARCH     =
+c++DBUG     =
+c++OPT      = -O2
+ptFLAGS     = -DNoRepository
+
+# - Standard warnings
+# - Less restrictive warnings (may be needed for flex++, CGAL, etc.).
+
+c++WARN     = \
+    -Wall -Wextra \
+    -Wnon-virtual-dtor -Wno-unused-parameter -Wno-invalid-offsetof \
+    -Wno-unknown-pragmas \
+    -Wno-undefined-var-template \
+    -diag-disable 327,654,1125,1292,2289,2304,11062,11074,11076 \
+    $(FOAM_EXTRA_CXXFLAGS)
+
+c++LESSWARN = \
+    -diag-disable 1224,2026,2305
+
+#------------------------------------------------------------------------------

wmake/rules/General/Icx/link-c

@@ -0,0 +1,5 @@
+LINK_LIBS   = $(cDBUG)
+
+LINKLIBSO   = $(cc) $(cFLAGS) -shared
+
+LINKEXE     = $(cc) $(cFLAGS) -Xlinker --add-needed -Xlinker -z -Xlinker nodefs

wmake/rules/General/Icx/link-c++

@@ -0,0 +1,11 @@
+LINK_LIBS   = $(c++DBUG)
+
+LINKLIBSO   = $(CC) $(c++FLAGS) -shared \
+    -Xlinker --add-needed \
+    -Xlinker --no-as-needed \
+    $(FOAM_EXTRA_LDFLAGS)
+
+LINKEXE     = $(CC) $(c++FLAGS) \
+    -Xlinker --add-needed \
+    -Xlinker --no-as-needed \
+    $(FOAM_EXTRA_LDFLAGS)

wmake/rules/General/Icx/openmp

@@ -0,0 +1,5 @@
+# Flags for compiling/linking openmp
+# The USE_OMP is for OpenFOAM-specific use (general use is _OPENMP)
+
+COMP_OPENMP = -DUSE_OMP -fiopenmp
+LINK_OPENMP = -fiopenmp