[source] thc-ipv6: Allow overriding CFLAGS

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/051a33e7c90b391a6b5128cd20c261497fff43f1

commit 051a33e7c90b391a6b5128cd20c261497fff43f1
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Sat Feb 4 20:57:34 2017 -0800

    thc-ipv6: Allow overriding CFLAGS
    
    thc-ipv6 did not allow an external environment to override CFLAGS, which
    would lead to our CFLAGS not being passed properly (relro,
    optimizations, etc...)
    
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
    (cherry picked from commit 9b2321f42d075a12e73a81b89bd49b8696d3700f)
---
 .../network/ipv6/thc-ipv6/patches/000-cflags_override.patch  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/package/network/ipv6/thc-ipv6/patches/000-cflags_override.patch b/package/network/ipv6/thc-ipv6/patches/000-cflags_override.patch
new file mode 100644
index 0000000..e1c36b6
--- /dev/null
+++ b/package/network/ipv6/thc-ipv6/patches/000-cflags_override.patch
@@ -0,0 +1,12 @@
+diff -urN thc-ipv6-2.7/Makefile thc-ipv6-2.7.new/Makefile
+--- thc-ipv6-2.7/Makefile	2014-12-27 05:05:30.000000000 -0800
++++ thc-ipv6-2.7.new/Makefile	2017-02-04 20:55:51.679898101 -0800
+@@ -3,7 +3,7 @@
+ 
+ CC=gcc
+ #CFLAGS=-g
+-CFLAGS=-O2
++CFLAGS?=-O2
+ CFLAGS+=$(if $(HAVE_SSL),-D_HAVE_SSL,)
+ LDFLAGS+=-lpcap $(if $(HAVE_SSL),-lssl -lcrypto,)
+ PROGRAMS=parasite6 dos-new-ip6 detect-new-ip6 fake_router6 fake_advertise6 fake_solicitate6 fake_mld6 fake_mld26 fake_mldrouter6 flood_mldrouter6 fake_mipv6 redir6 smurf6 alive6 toobig6 rsmurf6 implementation6 implementation6d sendpees6 sendpeesmp6 randicmp6 fuzz_ip6 flood_mld6 flood_mld26 flood_router6 flood_advertise6 flood_solicitate6 trace6 exploit6 denial6 fake_dhcps6 flood_dhcpc6 fake_dns6d fragmentation6 kill_router6 fake_dnsupdate6 ndpexhaust6 detect_sniffer6 dump_router6 fake_r [...]