[Buildroot] [git commit branch/2021.02.x] package/vlc: disable on riscv32

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=7c45b795ead9fde471211780516c3ebc30deffb1
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.02.x

vlc unconditionally uses __NR_futex resulting in the following build
failure on riscv32:

linux/thread.c:53:20: error: '__NR_futex' undeclared (first use in this function)
   53 |     return syscall(__NR_futex, addr, op, val, to, addr2, val3);
      |                    ^~~~~~~~~~

A patch that fixes this was submitted upstream, but rejected [1].

Fixes:
 - http://autobuild.buildroot.org/results/be0f2243919d7a052b33118d8a901c922f8d88e7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>

[1] https://patches.videolan.org/patch/30581/

(cherry picked from commit cc86b866ac8ddfe41679334526040f5426fa25b1)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/vlc/Config.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/package/vlc/Config.in b/package/vlc/Config.in
index 96ff8f2fcb..964b7660af 100644
--- a/package/vlc/Config.in
+++ b/package/vlc/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_VLC
 	bool "vlc"
+	depends on !BR2_RISCV_32
 	depends on BR2_USE_MMU # fork()
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on !BR2_STATIC_LIBS
@@ -23,6 +24,7 @@ config BR2_PACKAGE_VLC_OPENCV3_BACKEND
 	select BR2_PACKAGE_OPENCV3_LIB_OBJDETECT
 
 comment "vlc needs a toolchain w/ C++, dynamic library, wchar, threads, gcc >= 4.9, headers >= 3.7"
+	depends on !BR2_RISCV_32
 	depends on BR2_USE_MMU
 	depends on !BR2_INSTALL_LIBSTDCPP || BR2_STATIC_LIBS \
 		|| !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS \