fb: Rename wfbTriangles and wfbTrapezoids

fb: Rename wfbTriangles and wfbTrapezoids

These symbols were not renamed when they were added to libfb:

 # nm -D libwfb.so | grep ' fb'
 0000000000028d00 T fbTrapezoids
 0000000000028d60 T fbTriangles

This causes corruption and/or crashes on wfb-ful drivers like nvidia:

 Program received signal SIGABRT, Aborted.
 0x00007fd67f3a0405 in *__GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
 64      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
     in ../nptl/sysdeps/unix/sysv/linux/raise.c
 (gdb) bt
 #0  0x00007fd67f3a0405 in *__GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
 #1  0x00007fd67f3a3680 in *__GI_abort () at abort.c:92
 #2  0x00007fd67f3995b1 in *__GI___assert_fail (assertion=0x7fd679ecb804 "key->initialized", file=<optimized out>, line=116, function=0x7fd679ecbbc0 "dixGetPrivateAddr")
     at assert.c:81
 #3  0x00007fd679ec55b6 in ?? () from /usr/lib/xorg/modules/libfb.so
 #4  0x00007fd679eca9ef in ?? () from /usr/lib/xorg/modules/libfb.so
 #5  0x00007fd679ecae20 in fbTriangles () from /usr/lib/xorg/modules/libfb.so
 #6  0x00007fd67a58fc55 in ?? () from /usr/lib/xorg/modules/drivers/nvidia_drv.so
 #7  0x00000000004f38d1 in ?? ()
 #8  0x0000000000437ae9 in ?? ()
 #9  0x0000000000426eaa in ?? ()
 #10 0x00007fd67f38cead in __libc_start_main (main=<optimized out>, argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, fini=<optimized out>,
     rtld_fini=<optimized out>, stack_end=0x7fff99860d78) at libc-start.c:228
 #11 0x000000000042719d in _start ()

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit 03d032991da21bf866ca30dcbb6b7f9f99df441a)