Place your MinGW paths BEFORE your devkitPro paths.
Edit: you have too many MinGW installations going on there. Place c:/MinGW/bin and c:/MinGW/msys/1.0/bin before your devkitPro path (hint: you have it in your path TWICE and the first one is early on...), and add c:/Python27/Scripts and c:\devkitPro\devkitARM\bin.
Edit2: Also, my brain might be scrambled (been using different computers and OS's since the Commodore Vic-20) but some of those installations might not like it very much if your path is too long. You should place them at the beginning of your path.
Last edit: Ok, been replying from work off of memory, but the exact path I am using is a couple of posts above:
https://gbatemp.net/threads/noob-proof-guide-to-compile-rxtools-source.392242/page-3#post-5570397
read that post and get your mingw/msys/1.0/bin before devkitpro and you should be fine. Or you may have to add that libexec folder as well. Let me know if you do need it...
The gnuwin32 folder is where I put my gnu make.exe file with the .dlls that it requires.