[source] perf: avoid picking up a dependency on libunwind

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/412e0bbf25cf30b4e11706f5ffea3b0925e6fa61

commit 412e0bbf25cf30b4e11706f5ffea3b0925e6fa61
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sat Feb 11 17:46:46 2017 +0100

    perf: avoid picking up a dependency on libunwind
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/devel/perf/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/devel/perf/Makefile b/package/devel/perf/Makefile
index 8ff9bfa..f2f8d6c 100644
--- a/package/devel/perf/Makefile
+++ b/package/devel/perf/Makefile
@@ -51,6 +51,7 @@ MAKE_FLAGS = \
 	NO_GTK2=1 \
 	NO_LIBAUDIT=1 \
 	NO_LIBCRYPTO=1 \
+	NO_LIBUNWIND=1 \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
 	CC="$(TARGET_CC)" \
 	LD="$(TARGET_CROSS)ld" \