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/dtwm/Imakefile

@@ -27,12 +27,6 @@ EXTRA_CCOPTIONS = -xF
 dtwm := LOCAL_LDFLAGS = -M mapfile.reorder
 #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
- 
 SRCSXM = \
         WmCDInfo.c      WmCDecor.c      WmCEvent.c \
         WmCPlace.c      WmColormap.c    WmError.c \