[PATCH libdrm] meson: Fix sys/mkdev.h detection on Solaris

[Alan Coopersmith]

On Solaris, sys/sysmacros.h has long-deprecated copies of major() & minor()
but not makedev().  sys/mkdev.h has all three and is the preferred choice.

So we check for sys/mkdev.h first, as autoconf's AC_HEADER_MAJOR does.

Fixes build failure with error:
../xf86drm.c: In function ‘drmOpenMinor’:
../xf86drm.c:454:30: error: implicit declaration of function ‘makedev’ [-Werror=implicit-function-declaration]
  454 |         return drmOpenDevice(makedev(DRM_MAJOR, minor), minor, type);
      |                              ^~~~~~~

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 meson.build | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/meson.build b/meson.build
index bc5cfc58..a3363c32 100644
--- a/meson.build
+++ b/meson.build
@@ -183,10 +183,10 @@ foreach header : ['sys/sysctl.h', 'sys/select.h', 'alloca.h']
   config.set('HAVE_' + header.underscorify().to_upper(),
     cc.compiles('#include <@0@>'.format(header), name : '@0@ works'.format(header)))
 endforeach
-if cc.has_header_symbol('sys/sysmacros.h', 'major')
-  config.set10('MAJOR_IN_SYSMACROS', true)
-elif cc.has_header_symbol('sys/mkdev.h', 'major')
+if cc.has_header_symbol('sys/mkdev.h', 'major')
   config.set10('MAJOR_IN_MKDEV', true)
+elif cc.has_header_symbol('sys/sysmacros.h', 'major')
+  config.set10('MAJOR_IN_SYSMACROS', true)
 endif
 config.set10('HAVE_OPEN_MEMSTREAM', cc.has_function('open_memstream'))
 
-- 
2.15.2