ENH: simplify cpp rules to avoid absolute paths and multiple GFLAGS.

- otherwise /lib/cpp may need a different library binding than
  currently available and results in this type of error:

  /usr/lib64/gcc/x86_64-suse-linux/4.4/cc1:
  /data/app/OpenFOAM/ThirdParty-1.6.x/platforms/linux64/gcc-4.3.3/lib64/libstdc++.so.6:
  version `GLIBCXX_3.4.11' not found (required by
  /usr/lib64/libppl_c.so.2)

ENH: remove unused flex++ rule for SiCortex that was identical to the
general one anyhow.

wmake/rules/General/general

 AR         = ar
 ARFLAGS    = cr
 RANLIB     = ranlib
+CPP        = cpp
 LD         = ld
 
 GFLAGS     = -D$(WM_ARCH) -DWM_$(WM_PRECISION_OPTION)

wmake/rules/SiCortex64Gcc/flex++

-.SUFFIXES: .L
-
-Ltoo = flex --c++ -o $*.C -f $$SOURCE ; $(CC) $(c++FLAGS) -c $*.C -o $@
-
-.L.dep:
-	$(MAKE_DEP)

wmake/rules/SiCortex64Gcc/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = ld -A64
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl

wmake/rules/SunOS64Gcc/general

-CPP        = /lib/cpp $(GFLAGS)
+CPP        = /lib/cpp
 LD         = ld -64
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -lnsl -lsocket -L$(FOAM_LIBBIN)/dummy -lPstream

wmake/rules/linux64Gcc/general

-CPP        = /lib/cpp $(GFLAGS)
-LD         = ld
-
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl
 
 include $(GENERAL_RULES)/standard

wmake/rules/linux64Gcc43/general

-CPP        = /lib/cpp $(GFLAGS)
-LD         = ld
-
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl
 
 include $(GENERAL_RULES)/standard

wmake/rules/linux64Gcc44/general

-CPP        = /lib/cpp $(GFLAGS)
-LD         = ld
-
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl
 
 include $(GENERAL_RULES)/standard

wmake/rules/linux64Icc/general

-CPP        = /lib/cpp $(GFLAGS)
-LD         = ld
-
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl
 
 include $(GENERAL_RULES)/standard

wmake/rules/linuxGcc/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = ld -melf_i386
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl

wmake/rules/linuxGcc43/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = ld -melf_i386
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl

wmake/rules/linuxGcc44/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = ld -melf_i386
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl

wmake/rules/linuxIA64Gcc/general

-CPP        = /lib/cpp $(GFLAGS)
-LD         = ld
-
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl
 
 include $(GENERAL_RULES)/standard

wmake/rules/linuxIA64Icc/general

-CPP        = /lib/cpp $(GFLAGS) -DICC_IA64_PREFETCH
-AR         = ar
-ARFLAGS    = cr
-RANLIB     = ranlib
-LD         = ld
+CPP        = cpp -DICC_IA64_PREFETCH
 
 GLIBS      = -liberty
 

wmake/rules/linuxIcc/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = ld -melf_i386
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl

wmake/rules/linuxPPC64Gcc/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = ld -m elf64ppc
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -ldl

wmake/rules/linuxmingw32/general

-CPP        = /lib/cpp $(GFLAGS)
 LD         = mingw32-ld
 
 PROJECT_LIBS = -l$(WM_PROJECT)

wmake/rules/solarisGcc/general

-CPP        = /usr/lib/cpp -undef $(GFLAGS)
+CPP        = /usr/lib/cpp -undef
 
 PROJECT_LIBS = -l$(WM_PROJECT) -liberty -lnsl -lsocket -L$(FOAM_LIBBIN)/dummy -lPstream