Fix frame-packing==5 with some decoders

The spec mandates that frame-packing==5 requires the SEI on every frame that
begins a view sequence (i.e. the input frames L0-R0-L1-R1 have 4 view sequences,
but if reordered by the encoder to L0-L1-R0-R1 there are now 2 view sequences).
For simplicity, we write the SEI on every frame.

This fixes frame-packing==5 3D playback on some decoders (PlayStation 3, Sony
W8 series, possibly others).
Fix b-pyramid MMCO remove for frame-packing==5
Fix incorrect row predictor addressing

Somehow managed to not cause things to explode, but was clearly incorrect.
Might improve VBV in some cases to have this working right.
x86: Fix SIGILL in high bit-depth intra_sad_x3_4x4_sse2

An SSE3 instruction was used in an SSE2 function.
AVC-Intra: fix compatibility with Avid Transfermanager
Disable i8x8 in lossless

x264's implementation was slightly incorrect due to a vague spec, so some
decoders decoded video incorrectly.

Minimal impact on compression.
opencl: Check return value of fread()

common/opencl.c:138:10: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result]
build: Set all ASFLAGS from within configure

This is how all other toolchain flags are handled.
configure: Don't check for libavcore

libavcore was a never-released bad idea with a short lifespan.
Delete all SPARC optimizations

SPARC has been obsolete for a long time and makes little sense as a
H.264 encoding platform.

Also update authors file.
build: Add dependencies on x86inc.asm/x86util.asm for all .asm files

This is a little bit overzealous, but errs on the side of caution.
Generating full dependency information is also possible, but slightly
slows down the build as YASM cannot do it as a sideeffect of compilation.
configure: Drop workaround for obsolete gcc 4.2 on ARM
build: Simplify phony target declaration with wildcards

Also add etags to list of phony targets.
build: Replace cltostr.pl by a shell script

This avoids a dependency on Perl to build OpenCL support.
configure: Add -Wno-maybe-uninitialized to CFLAGS

The warnings generated by -Wmaybe-uninitialized are mostly spurious.
MSVS 2013 Update 2 support

The first MSVS compiler C99 compliant enough to build x264.
Use `CC=cl ./configure` to compile with it.
Remove meaningless use of abs()
mp4_lsmash: Use new I/O API instead of deprecated one.
Check malloc during frame dumping
Check pf_log is set in validate_parameters

Help remind people to call x264_param_default in case they didn't read the
documentation.