1. Replace snapvector.asm with snapvector.c
2. Modify SConscript.core to remove x86 assembly files.
Merge branch 'master' of https://github.com/daiakushi/Enemy-Territory
1. Modify SConstruct
	a. do not suppress 'cpu' to 'cpu'
	b. remove -march=armv7 from OPTCPPFLAGS
	c. add a macro 'DLL_CPU' to CORECPPFLAGS
2. In Sys_GetDLLName() use DLL_CPU to get DLL file
3. Implement GetClockTicks() for explicit ARMv7 (gcc inline assembly)