graphics/mesa-devel: unbreak on -CURRENT after GNU qsort_r

In file included from ../src/util/u_qsort.cpp:24:
../src/util/u_qsort.h:68:4: error: no matching function for call to 'qsort_r'
   qsort_r(base, nmemb, size, &data, util_qsort_adapter);
   ^~~~~~~
/usr/include/stdlib.h:314:7: note: candidate function not viable: no known conversion from 'struct util_qsort_adapter_data *' to 'int (*)(const void *, const void *, void *)' for 4th argument
void     qsort_r(void *, size_t, size_t,
         ^

PR:		266227
Reported by:	antoine (via exp-run)
Submitted by:	delphij

graphics/mesa-devel/Makefile

@@ -10,6 +10,7 @@ PATCHFILES+=	50433886a3e3.patch:-p1 # https://gitlab.freedesktop.org/mesa/mesa/-
 PATCHFILES+=	4356e7185193.patch:-p1 # https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16987
 PATCHFILES+=	b2a22acce617.patch:-p1 # https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16987
 PATCHFILES+=	19eb2c30bff0.patch:-p1 # https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16987
+PATCHFILES+=	8f1aa7dc16df.patch:-p1 # https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18527
 
 MAINTAINER=	jbeich@FreeBSD.org
 COMMENT=	Bleeding edge Mesa drivers (OpenGL, Vulkan)

graphics/mesa-devel/distinfo

@@ -11,3 +11,5 @@ SHA256 (b2a22acce617.patch) = 9ec231cdcec3235164b0c0298d35e65225940878e75d9f972b
 SIZE (b2a22acce617.patch) = 2425
 SHA256 (19eb2c30bff0.patch) = 238e1031e32bda8fa72bd649df857d775ffe5caec26c1d4428215cf65f564c2b
 SIZE (19eb2c30bff0.patch) = 1217
+SHA256 (8f1aa7dc16df.patch) = 8e53f4030197998492b16ff0315db195389bd0e508258f0650dd474f0225e202
+SIZE (8f1aa7dc16df.patch) = 2804