build: resolve 1 instance of -Wmissing-prototypes

compat_xtables.c:30:7: warning: no previous prototype for "HX_memmem"
[-Wmissing-prototypes]

diff --git a/extensions/compat_xtables.c b/extensions/compat_xtables.c
index 1051204ec9aad552f1b70ad78ef2b02b6ae25f20..0b8293da56aee02e57c611eb78fcd41adcfabc94 100644 (file)
--- a/extensions/compat_xtables.c
+++ b/extensions/compat_xtables.c
@@ -27,6 +27,7 @@
 #      define WITH_IPV6 1
 #endif
 
+extern void *HX_memmem(const void *space, size_t spacesize, const void *point, size_t pointsize);
 void *HX_memmem(const void *space, size_t spacesize,
     const void *point, size_t pointsize)
 {