Fix link failure with gcc 10
Without the 'extern' this looks like a definition not just a declaration, in every file that includes the header. gcc 10 is stricter about this kind of multiple definition.
| Status | Job ID | Name | Coverage | ||||||
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| passed |
#1554793
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debian-testing |
00:00:21
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| Build | |||||||||
| passed |
#1554796
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xserver-1.13 |
00:00:28
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| passed |
#1554797
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xserver-1.14 |
00:00:22
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| passed |
#1554798
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xserver-1.15 |
00:00:28
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| passed |
#1554799
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xserver-1.16 |
00:00:57
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| passed |
#1554800
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xserver-1.17 |
00:00:24
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| passed |
#1554801
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xserver-1.18 |
00:00:29
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| passed |
#1554802
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xserver-1.18-clang |
00:00:27
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| passed |
#1554803
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xserver-1.19 |
00:00:28
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| passed |
#1554804
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xserver-1.19-clang |
00:00:38
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| passed |
#1554794
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xserver-1.20 |
00:01:08
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| passed |
#1554795
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xserver-1.20-clang |
00:00:44
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