[mod_verto] Fix scan-build warnings in swig and enable scan-build on Drone

.drone.yml

@@ -88,7 +88,6 @@ steps:
       - sed -i '/mod_rtmp/s/^/#/g' modules.conf
       - sed -i '/mod_skinny/s/^/#/g' modules.conf
       - sed -i '/mod_unimrcp/s/^/#/g' modules.conf
-      - sed -i '/mod_verto/s/^/#/g' modules.conf
       - sed -i '/mod_xml_rpc/s/^/#/g' modules.conf
       - ./configure
       - mkdir -p scan-build
@@ -121,6 +120,6 @@ trigger:
 
 ---
 kind: signature
-hmac: affb0747b0f16d9673cbbb327451c99fefc9dee2fd30b34b220bf147ad96a7be
+hmac: cddd8905a309e3deb7e5859b11aa1ec3593410d9f32ce2f5de3a3557af88f80f
 
 ...

src/mod/endpoints/mod_verto/mcast/MCAST.i

@@ -1,3 +1,13 @@
+%begin %{
+#ifdef __clang_analyzer__
+#include <string.h>
+static int mystrcmp (const char *a, const char *b) {
+    return a == b ? 0 : !a ? -1 : !b ? 1 : strcmp(a, b);
+}
+#define strcmp mystrcmp
+#endif
+%}
+
 %{
 #include "mcast.h"
 #include "mcast_cpp.h"

src/mod/endpoints/mod_verto/mcast/mcast_wrap.cpp

@@ -8,6 +8,15 @@
  * interface file instead.
  * ----------------------------------------------------------------------------- */
 
+#ifdef __clang_analyzer__
+#include <string.h>
+static int mystrcmp (const char *a, const char *b) {
+    return a == b ? 0 : !a ? -1 : !b ? 1 : strcmp(a, b);
+}
+#define strcmp mystrcmp
+#endif
+
+
 
 #ifndef SWIGPERL
 #define SWIGPERL