[Rd] SHLIB_CXXLDFLAGS needs quotes on Solaris section of admin manual.

[Dr. David Kirkby]

In the admin manual, there is some information about flags etc for Solaris:

CC="cc -xc99"
CPPFLAGS=-I/opt/csw/include
CFLAGS="-O -xlibmieee"
F77=f95
FFLAGS=-O4
CXX=CC
CXXFLAGS=-O
FC=f95
FCFLAGS=$FFLAGS
LDFLAGS=-L/opt/csw/lib
SHLIB_CXXLDFLAGS=-G -lCstd

Where as the CC command is quoted, the SHLIB_CXXLDFLAGS one is not. 
Failure to put quotes around it results in configure script aborting.