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 branch 'master' of https://github.com/cisco/openh264
Merge pull request #387 from zhilwang/arm-asm

Arm asm
Merge pull request #386 from volvet/refine_processing

refine build spatial list in processing
Merge branch 'master' of https://github.com/cisco/openh264