fix crashy bug in slot2_gbagame and also change it to use EMUFILE while I was at it, like it shouldve been in the first place. but.. i didnt really test it.

git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@4943 5577840e-afb3-4e59-9ef3-2b7f898b1952
add warning when booting homebrew game while using "stream rom from disk" since it doesnt work right now, and it essentially breaks most homebrew apps by default.

git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@4944 5577840e-afb3-4e59-9ef3-2b7f898b1952
speedfix for speedtyporeport

git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@4945 5577840e-afb3-4e59-9ef3-2b7f898b1952