misc: Use stdlib.h instead of malloc.h to make it compile on FreeBSD

/usr/include/malloc.h:3:2: error: #error "<malloc.h> has been replaced by <stdlib.h>"

configure.ac

@@ -17,7 +17,7 @@ AC_PROG_INSTALL
 
 # Checks for header files.
 AC_HEADER_STDC
-AC_CHECK_HEADERS([malloc.h netinet/in.h stdint.h string.h])
+AC_CHECK_HEADERS([stdlib.h netinet/in.h stdint.h string.h])
 
 found_libxml2=yes
 PKG_CHECK_MODULES(LIBXML2, libxml-2.0, , found_libxml2=no)

src/smpp34_dumpBuf.c

@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 

src/smpp34_dumpPdu.c

@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 

src/smpp34_pack.c

@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 

src/smpp34_params.c

@@ -21,7 +21,7 @@
  *
  */
 #include <stdio.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <string.h>
 #ifdef __linux__
 #include <stdint.h>

src/smpp34_structs.c

@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 

src/smpp34_unpack.c

@@ -22,7 +22,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <netinet/in.h>