glsl/nir: fix invalid C++ designated initialiser

Fixes: 83fd1e58 ("glsl/nir: Add and use a gl_nir_link() function")
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
23 jobs for !1938 with glsl-nir-fix in 53 minutes and 53 seconds (queued for 16 minutes and 40 seconds)
latest detached
Status Job ID Name Coverage
  Containers Build
passed #594238
debian

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  Build+Test
passed #594247
meson-arm64

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passed #594246
meson-armhf

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passed #594241
meson-clang

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passed #594244
meson-clover

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passed #594248
meson-i386

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passed #594239
meson-main

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passed #594240
meson-swr-glvnd

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passed #594245
meson-vulkan

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passed #594250
scons-llvm

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passed #594249
scons-nollvm

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passed #594242
scons-swr

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passed #594243
scons-win64

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  Test
passed #594251
test-llvmpipe-gles2 1/4

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passed #594252
test-llvmpipe-gles2 2/4

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passed #594253
test-llvmpipe-gles2 3/4

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passed #594254
test-llvmpipe-gles2 4/4

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passed #594255
test-softpipe-gles2 1/4

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passed #594256
test-softpipe-gles2 2/4

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passed #594257
test-softpipe-gles2 3/4

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passed #594258
test-softpipe-gles2 4/4

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passed #594259
test-softpipe-gles3-limited

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  External
passed continuous-integration/appveyor/branch