Kill Core::g_CoreStartupParameter.
Fix building x86_64 on Android.

Missed a define in x64MemTools for when the thought process was Android == ARM
Also changes the variable we use for choosing which folders to copy to and from our jni file.
This has changed since the x86_64 build target uses the library folder x86-64, which is stupid and annoying.
Merge pull request #1033 from Sonicadvance1/fix-android-x86_64

Fix building x86_64 on Android.
Merge pull request #1041 from RachelBryk/kill-g_CoreStartupParameter

Kill Core::g_CoreStartupParameter.
JIT: remove op merging code that served no purpose

Dolphin already tracks propagation of immediates, so this code didn't really do
anything useful.