tweaks to patch from reedbeta

stb_image.h

@@ -143,6 +143,7 @@
 
 
    Latest revision history:
+      2.07  (2015-09-13) fix compiler warnings
       2.06  (2015-04-19) fix bug where PSD returns wrong '*comp' value
       2.05  (2015-04-19) fix bug in progressive JPEG handling, fix warning
       2.04  (2015-04-15) try to re-enable SIMD on MinGW 64-bit
@@ -203,6 +204,7 @@
                                                  Martins Mozeiko
                                                  Joseph Thomson
                                                  Phil Jordan
+                                                 Nathan Reed
 
 LICENSE
 
@@ -3502,10 +3504,10 @@ static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num)
          z->size [c] = (stbi_uc     ) s;
          z->value[c] = (stbi__uint16) i;
          if (s <= STBI__ZFAST_BITS) {
-            k = stbi__bit_reverse(next_code[s],s);
-            while (k < (1 << STBI__ZFAST_BITS)) {
-               z->fast[k] = fastv;
-               k += (1 << s);
+            int j = stbi__bit_reverse(next_code[s],s);
+            while (j < (1 << STBI__ZFAST_BITS)) {
+               z->fast[j] = fastv;
+               j += (1 << s);
             }
          }
          ++next_code[s];
@@ -5556,7 +5558,7 @@ static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
 static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
 {
    stbi_uc lzw_cs;
-   stbi__int32 len, code;
+   stbi__int32 len, init_code;
    stbi__uint32 first;
    stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
    stbi__gif_lzw *p;
@@ -5569,10 +5571,10 @@ static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
    codemask = (1 << codesize) - 1;
    bits = 0;
    valid_bits = 0;
-   for (code = 0; code < clear; code++) {
-      g->codes[code].prefix = -1;
-      g->codes[code].first = (stbi_uc) code;
-      g->codes[code].suffix = (stbi_uc) code;
+   for (init_code = 0; init_code < clear; init_code++) {
+      g->codes[init_code].prefix = -1;
+      g->codes[init_code].first = (stbi_uc) init_code;
+      g->codes[init_code].suffix = (stbi_uc) init_code;
    }
 
    // support no starting clear code
@@ -5591,7 +5593,7 @@ static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
          bits |= (stbi__int32) stbi__get8(s) << valid_bits;
          valid_bits += 8;
       } else {
-         code = bits & codemask;
+         stbi__int32 code = bits & codemask;
          bits >>= codesize;
          valid_bits -= codesize;
          // @OPTIMIZE: is there some way we can accelerate the non-clear path?