Add ARM 32bit asm code for decoder.
Remove deblocking arm asm code to common folder, add cpu detect for arm, clean some code.
Only set x86 ASMFLAGS if building x86 assembly
Remove a redundant makefile ifdef

ASM_ARCH=x86 is only set if USE_ASM is enabled.
refine build spatial list in processing
Modify code style, remove trailing space.
Remove trailing space.
remove uiFrameIdxRc
Modify function name according latest cisco master
Merge pull request #396 from volvet/refine_frame_idx

remove uiFrameIdxRc
remove unused declarations in as264_common.h
Merge pull request #397 from licaiguo/remove-undefined-asm-functions

remove unused declarations in as264_common.h
Merge pull request #376 from mstorsjo/simplify-x86-asm-makefiles

Simplify makefiles with respect to x86 assembly
Merge pull request #387 from zhilwang/arm-asm

Arm asm
Merge pull request #386 from volvet/refine_processing

refine build spatial list in processing
remove execute attribute of the arm asm files
Merge pull request #398 from volvet/develop_b

remove execute attribute of the arm asm files
Convert the arm assembly sources to unix newlines
Merge pull request #400 from mstorsjo/cleanup-arm-assembly

Convert the arm assembly sources to unix newlines
Update the makefile generator to support .S arm assembly files

These are built if ASM_ARCH is set to arm.