Make sure mklib sees the definition of CC and CXX. Make mklib respect

the definitions of CC and CXX on Linux.  This fixed build issues with
sunos5-gcc and build issues on GCC 2.x Linux when CC and CXX are set
to a GCC 3.x compiler.

bin/mklib

@@ -122,9 +122,9 @@ case $ARCH in
 	    #OPTS="-shared -Wl,-soname,${LIBNAME}"  # soname???
 	    OPTS="-shared"
             if [ $CPLUSPLUS = 1 ] ; then
-                LINK="g++"
+                LINK=$CXX
             else
-                LINK="gcc"
+                LINK=$CC
             fi
             rm -f ${LIBNAME}
 
@@ -158,9 +158,9 @@ case $ARCH in
             echo "mklib: Making" $ARCH "shared library: " ${LIBNAME}.so.${VERSION}
 
             if [ $CPLUSPLUS = 1 ] ; then
-                LINK="g++"
+                LINK=$CXX
             else
-                LINK="gcc"
+                LINK=$CC
             fi
 
             # rm any old libs