[openwrt/openwrt] libsepol: fix build on non-Linux systems

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/2a9fb827aa2a1213e2eae465fd24c6a829b35501

commit 2a9fb827aa2a1213e2eae465fd24c6a829b35501
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Thu Aug 13 20:03:43 2020 +0200

    libsepol: fix build on non-Linux systems
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/libs/libsepol/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/libs/libsepol/Makefile b/package/libs/libsepol/Makefile
index cd49ed008d..5309523659 100644
--- a/package/libs/libsepol/Makefile
+++ b/package/libs/libsepol/Makefile
@@ -36,7 +36,8 @@ HOST_MAKE_FLAGS += \
 	SHLIBDIR=$(STAGING_DIR_HOSTPKG)/lib
 
 MAKE_FLAGS += \
-	SHLIBDIR=/usr/lib
+	SHLIBDIR=/usr/lib \
+	OS=Linux
 
 define Build/Compile
 	$(call Build/Compile/Default,all)