[Buildroot] [git commit] package/snort3: link with -latomic if needed

commit: https://git.buildroot.net/buildroot/commit/?id=912f9511de54f5a647e7aca52594c3020fe15ee8
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fix the following build failure raised since bump to version 3.1.6
in commit e66f2fd310374779d415fa683813cc5f5ccf6be9 and
https://github.com/snort3/snort3/commit/3e518d86040e74c328bcc0d5bbd49c1da6b7a3ec:

/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/powerpc-buildroot-linux-uclibc/9.3.0/../../../../powerpc-buildroot-linux-uclibc/bin/ld: service_inspectors/dce_rpc/CMakeFiles/dce_rpc.dir/dce_smb2_file.cc.o: undefined reference to symbol '__atomic_load_8@@LIBATOMIC_1.0'

Fixes:
 - http://autobuild.buildroot.org/results/df34a69175e61bc7b180d89c738747e19aaf13bf

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <redacted>
---
 package/snort3/snort3.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/package/snort3/snort3.mk b/package/snort3/snort3.mk
index aabc89e165..7495ab9b0f 100644
--- a/package/snort3/snort3.mk
+++ b/package/snort3/snort3.mk

@@ -54,4 +54,9 @@ else
 SNORT3_CONF_OPTS += -DHAVE_LZMA=OFF
 endif
 
+# Uses __atomic_load_8
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+SNORT3_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
+endif
+
 $(eval $(cmake-package))

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