This patch fiddles the linker flags for top-3.5 to
prepend "-Wl," on AIX+gcc, since gcc doesn't understand
"-b" linker flags like xlc does.
This prevents these errors during build:
gcc -O -o top top.o commands.o display.o screen.o
username.o utils.o version.o getopt.o machine.o
-lcurses -lm -bD:0x18000000
gcc: `-b' must come at the start of the command line