address compilation failures

Author: Brandon Strub

src/flb_gzip.c

@@ -649,7 +649,7 @@ int flb_gzip_uncompress_multi(void *in_data, size_t in_len,
 
     out_index = 0;
     for (i = 0; i <= buffer_index; i++) {
-        memcpy(out_buf + out_index, buffers[i], buffer_lengths[i]);
+        memcpy(((char *) out_buf) + out_index, buffers[i], buffer_lengths[i]);
         out_index += buffer_lengths[i];
         flb_free(buffers[i]);
     }

tests/internal/gzip.c

@@ -64,9 +64,10 @@ void test_compress_multi()
     size_t uncompressed_len = 0;
 
     size_t in_remaining = 0;
+    size_t i = 0;
 
     // apply simple rot 16 to lowercase letters
-    for (int i = 0; i < original_len; i++) {
+    for (i = 0; i < original_len; i++) {
         char c = original[i];
 
         if (c >= 'a' && c <= 'z') {
@@ -134,8 +135,9 @@ void test_compress_large()
     void *uncompressed = NULL;
     size_t uncompressed_len = 0;
     size_t in_remaining = 0;
+    size_t i = 0;
 
-    for (int i = 0; i < original_len; i++) {
+    for (i = 0; i < original_len; i++) {
         original[i] = i % 256;
     }