Fix android build

Author: matthiasblaesing

native/dispatch.c

@@ -71,7 +71,7 @@
 #define DEFAULT_LOAD_OPTS (RTLD_LAZY|RTLD_GLOBAL)
 #define LOAD_LIBRARY(NAME,OPTS) dlopen(NAME, OPTS)
 static inline char * LOAD_ERROR() {
-    char* message = dlerror();
+    const char* message = dlerror();
     char* buf = (char*) malloc(strlen(message) + 1 /* null */);
     strcpy(buf, message);
     return buf;

native/testlib.c

@@ -911,10 +911,11 @@ addVarArgs(const char *fmt, ...) {
 EXPORT int32_t
 addSeveralFixedArgsAndVarArgs(int a, int b, int c, int d, int n_varargs, ...) {
   va_list ap;
+  int i;
   int32_t sum = a + b + c + d;
   va_start(ap, n_varargs);
 
-  for (int i = 0; i < n_varargs; i++) {
+  for (i = 0; i < n_varargs; i++) {
     sum += va_arg(ap, int32_t);
   }
   va_end(ap);
@@ -1108,8 +1109,9 @@ EXPORT size_t copyString(char* input, char* output) {
  * responsible to allocate a correctly sized buffer.
  */
 EXPORT size_t copyStringArray(char** input, char* output) {
+    int i;
     size_t len = 0;
-    for(int i = 0;; i++) {
+    for(i = 0;; i++) {
         char* currInput = input[i];
         if(currInput == NULL) {
             break;