message: Fix gcc 6.3 uninitialized warning in release builds
diff: @@ -1318,7 +1318,7 @@ bool ImFontAtlas::Build()
  TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyph_count > 4000) ? 4096 : (total_glyph_count > 2000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512;
  TexHeight = 0;
  const int max_tex_height = 1024*32;
  - stbtt_pack_context spc;
  + stbtt_pack_context spc = { NULL };
  stbtt_PackBegin(&spc, NULL, TexWidth, max_tex_height, 0, 1, NULL);
  // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
  