Remove hardcoded CCLINK's in Imakefiles when linking with C++ built libs (DtSvc).

Added proper SharedDtSvcReqs in lnxLib.tmpl and CplusplusLibC in
linux.cf.  This allows the libstdc++ dependancy to be properly
declared for libDtSvc so that it is not neccessary to hardcode 'CCLINK
= g++' in the Imakefiles of programs linking angainst libDtSvc.

cde/programs/dtudcexch/Imakefile

@@ -28,12 +28,6 @@ UDC_INC_PATH7     =  -I$(FONTEDT_PATH1)/dtgpftobdf
         OPT2 = -DFONTC='"'$(BINDIR)/bdftopcf'"'
 #endif
 
-XCOMM On Linux once you link against a C++ library the whole program
-XCOMM has to be linked with the C++ linker
-#if defined(LinuxArchitecture)
-CCLINK = $(CXX)
-#endif
-
 DEFINES = $(OPT2)
 
 DEPLIBS = $(DEPDTSVCLIB) $(DEPTTLIB) $(DEPXMLIB) $(DEPXTOOLLIB) \