[Buildroot] [git commit branch/2021.08.x] package/qemu: disable doc generation for host build

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=6b471a330e54c1c2ff2a66e13e8ddfd98eeee33c
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.08.x

- disable doc generation (via sphinx) for host build

Reduces host-qemu build time from (on a system with sphinx installed):

	real    2m5,522s
	user    9m41,292s
	sys     1m9,732s

to:
	real	1m9,183s
	user	8m40,131s
	sys	1m9,533s

Signed-off-by: Peter Seiderer <ps.report at gmx.net>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
(cherry picked from commit df857f6e0fd9d0815c12519ca239de0b0fd2b96b)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/qemu/qemu.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/qemu/qemu.mk b/package/qemu/qemu.mk
index 520618cd55..69949cfd7b 100644
--- a/package/qemu/qemu.mk
+++ b/package/qemu/qemu.mk
@@ -354,6 +354,7 @@ define HOST_QEMU_CONFIGURE_CMDS
 		--disable-bzip2 \
 		--disable-containers \
 		--disable-curl \
+		--disable-docs \
 		--disable-libssh \
 		--disable-linux-io-uring \
 		--disable-sdl \