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/dtpad/Imakefile

@@ -11,12 +11,6 @@ SYS_LIBRARIES = DtClientSysLibs DtClientExtraLibs
 #   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
-
 SRCS = \
         dtpad.c         editCB.c        fileCB.c \
         fileDlg.c       fileIo.c        formatCB.c \