[openHEVC][ARM][hevc_rext] Resolve linking errors during ARM crosscompile

    Adding files from the latest ffmpeg source tree to resolve the
    linker dependecies while generating final executables with VFP
    and ARM Neon Support during CROSS COMPILING for ARM using Linaro's
    GCC arm-linux-gnueabihf toolchain on x86 Machine

Signed-off-by: Nitin Chaudhary <Nitin.Chaudhary@zii.aero>

Author: NitinChaudharyUSC

CMakeLists.txt

@@ -296,6 +296,7 @@ list(APPEND libfilenames
     libavutil/arm/asm.S
     libavcodec/arm/fft_init_arm.c
     libavcodec/arm/fft_neon.S
+    libavcodec/arm/fft_vfp.S
     libavcodec/arm/hevcdsp_init_arm.c
     libavcodec/arm/hevcdsp_deblock_neon.S
     libavcodec/arm/hevcdsp_idct_neon.S
@@ -305,10 +306,13 @@ list(APPEND libfilenames
     libavcodec/arm/hpeldsp_arm.S
     libavcodec/arm/hpeldsp_init_arm.c
     libavcodec/arm/hpeldsp_init_neon.c
+    libavcodec/arm/hpeldsp_init_armv6.c
     libavcodec/arm/hpeldsp_neon.S
+    libavcodec/arm/hpeldsp_armv6.S
     libavcodec/arm/int_neon.S
     libavcodec/arm/jrevdct_arm.S
     libavcodec/arm/mdct_neon.S
+    libavcodec/arm/mdct_vfp.S
     libavcodec/arm/rdft_neon.S
     libavcodec/arm/simple_idct_arm.S
     libavcodec/arm/simple_idct_armv6.S