mesa/math: delete duplicate extern symbol

It's already defined in `m_debug_util.h`, along with an explanation of
what it is and how to use it.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
50 jobs for !2354 with math-delete-leftover in 12 minutes and 57 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Container
passed #758771
debian-10

00:00:29

passed #758772
debian-9

00:00:22

passed #758770
lava-container:arm64

00:00:30

passed #758769
lava-container:armhf

00:00:29

passed #758773
aarch64
test-container:arm64

00:00:19

 
  Build
passed #758775
lava-build:arm64

00:02:13

passed #758774
lava-build:armhf

00:02:11

passed #758778
meson-arm64

00:04:52

passed #758777
meson-armhf

00:03:53

passed #758780
meson-clang

00:07:52

passed #758783
meson-clover

00:06:25

passed #758784
meson-clover-old-llvm

00:05:40

passed #758786
meson-i386

00:04:35

passed #758776
meson-main

00:05:15

passed #758779
meson-swr-glvnd

00:05:28

passed #758785
meson-vulkan

00:03:04

passed #758787
scons

00:09:36

passed #758788
scons-old-llvm

00:07:42

passed #758781
scons-swr

00:05:34

passed #758782
scons-win64

00:06:23

 
  Test
passed #758813
db410c
arm64_a306_gles2 1/4

00:03:36

passed #758814
db410c
arm64_a306_gles2 2/4

00:04:32

passed #758815
db410c
arm64_a306_gles2 3/4

00:03:43

passed #758816
db410c
arm64_a306_gles2 4/4

00:03:50

passed #758802
mesa-cheza
arm64_a630_gles2

00:04:05

passed #758803
mesa-cheza
arm64_a630_gles31 1/4

00:03:51

passed #758804
mesa-cheza
arm64_a630_gles31 2/4

00:04:37

passed #758805
mesa-cheza
arm64_a630_gles31 3/4

00:04:36

passed #758806
mesa-cheza
arm64_a630_gles31 4/4

00:04:33

passed #758807
mesa-cheza
arm64_a630_gles3 1/6

00:03:26

passed #758808
mesa-cheza
arm64_a630_gles3 2/6

00:03:24

passed #758809
mesa-cheza
arm64_a630_gles3 3/6

00:03:16

passed #758818
mesa-cheza
arm64_a630_gles3 4/6

00:03:21

passed #758811
mesa-cheza
arm64_a630_gles3 5/6

00:03:27

passed #758812
mesa-cheza
arm64_a630_gles3 6/6

00:03:25

passed #758792
lava-meson-gxl-s905x-libretech-cc
lima-test:arm64

00:06:06

passed #758791
lava-sun8i-h3-libretech-all-h3-cc
lima-test:armhf

00:09:57

passed #758789
lava-rk3288-veyron-jaq
panfrost-t760-test:armhf

00:05:38

passed #758790
lava-rk3399-gru-kevin
panfrost-t860-test:arm64

00:04:41

passed #758793
test-llvmpipe-gles2 1/4

00:03:30

passed #758794
test-llvmpipe-gles2 2/4

00:03:46

passed #758795
test-llvmpipe-gles2 3/4

00:03:30

passed #758796
test-llvmpipe-gles2 4/4

00:03:51

passed #758797
test-softpipe-gles2 1/4

00:01:38

passed #758798
test-softpipe-gles2 2/4

00:01:31

passed #758799
test-softpipe-gles2 3/4

00:01:25

passed #758800
test-softpipe-gles2 4/4

00:01:31

passed #758801
test-softpipe-gles3-limited

00:03:18

failed #758810
mesa-cheza
arm64_a630_gles3 4/6

00:00:11

 
  External
canceled continuous-integration/appveyor/branch