[Buildroot] [PATCH 1/1] package/libselinux: fix glibc build with old toolchains

[Fabrice Fontaine <fontaine.fabrice@gmail.com>]

For an unknown reason, since bump to version 3.0.0, we got build failure
due to -D_FILE_OFFSET_BITS==64:

/home/naourr/work/instance-2/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/fts.h:41:3: error: #error "<fts.h> cannot be used with -D_FILE_OFFSET_BITS==64"
 # error "<fts.h> cannot be used with -D_FILE_OFFSET_BITS==64"
   ^

Update our workaround to also filter CPPFLAGS fix the issue and seems
right as we're doing it for all the other affected packages
(restorecond, elfutils ...)

Fixes:
 - http://autobuild.buildroot.org/results/200fd0accf6a1926251243b05e600fbf591bb3a2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
 package/libselinux/libselinux.mk | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/package/libselinux/libselinux.mk b/package/libselinux/libselinux.mk
index b53146e30b..258065b79d 100644
--- a/package/libselinux/libselinux.mk
+++ b/package/libselinux/libselinux.mk
@@ -45,12 +45,13 @@ define LIBSELINUX_BUILD_PYTHON_BINDINGS
 endef
 endif # python3
 
-# Filter out D_FILE_OFFSET_BITS=64. This fixes errors caused by glibc
-# 2.22. We set CFLAGS and LDFLAGS here because we want to win over the
-# CFLAGS/LDFLAGS definitions passed by $(PKG_PYTHON_DISTUTILS_ENV)
+# Filter out D_FILE_OFFSET_BITS=64. This fixes errors caused by glibc 2.22. We
+# set CFLAGS, CPPFLAGS and LDFLAGS here because we want to win over the
+# CFLAGS/CPPFLAGS/LDFLAGS definitions passed by $(PKG_PYTHON_DISTUTILS_ENV)
 # when the python binding is enabled.
 LIBSELINUX_MAKE_OPTS += \
 	CFLAGS="$(filter-out -D_FILE_OFFSET_BITS=64,$(TARGET_CFLAGS))" \
+	CPPFLAGS="$(filter-out -D_FILE_OFFSET_BITS=64,$(TARGET_CPPFLAGS))" \
 	LDFLAGS="$(TARGET_LDFLAGS) -lpcre -lpthread"
 
 define LIBSELINUX_BUILD_CMDS
-- 
2.25.1