gas: add headers to swig files

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/gas/jsupm_gas.i

@@ -2,8 +2,27 @@
 %include "../upm.i"
 %include "../carrays_uint16_t.i"
 
+%include "gas.h"
 %{
     #include "gas.h"
 %}
 
-%include "gas.h"
+%include "mq2.h"
+%{
+    #include "mq2.h"
+%}
+
+%include "mq3.h"
+%{
+    #include "mq3.h"
+%}
+
+%include "mq5.h"
+%{
+    #include "mq5.h"
+%}
+
+%include "mq9.h"
+%{
+    #include "mq9.h"
+%}

src/gas/pyupm_gas.i

@@ -10,3 +10,24 @@
 %{
     #include "gas.h"
 %}
+
+%include "mq2.h"
+%{
+    #include "mq2.h"
+%}
+
+%include "mq3.h"
+%{
+    #include "mq3.h"
+%}
+
+%include "mq5.h"
+%{
+    #include "mq5.h"
+%}
+
+%include "mq9.h"
+%{
+    #include "mq9.h"
+%}
+