Gentoo support

[beaumanvienna]

Under Gentoo, these emulation targets are fully operational:

• "ps1","psp","sega genesis","snes","nes","wii","n64", "gba", "gbc"

These have issues with the controller:

• "ps2","gamecube"

[beaumanvienna]

Issue for "ps2" and "gamecube" fixed with 88c9b1a