Remove unused softfloat implementation.

The softfloat functionality is unused, not installed and incomplete. On platforms without floating point units, the compiler provides a softfloat implementation so there is no point in carrying this code around locally.
linjiansheng · May 11, 2011 · bea7057 · bea7057
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diff --git a/doc/avutil.txt b/doc/avutil.txt
@@ -19,7 +19,6 @@ integer.c               128bit integer math
 lls.c
 mathematics.c           greatest common divisor, integer sqrt, integer log2, ...
 mem.c                   memory allocation routines with guaranteed alignment
-softfloat.c
 
 Headers:
 bswap.h                 big/little/native-endian conversion code

diff --git a/libavutil/Makefile b/libavutil/Makefile
@@ -75,7 +75,7 @@ OBJS-$(ARCH_ARM) += arm/cpu.o
 OBJS-$(ARCH_PPC) += ppc/cpu.o
 OBJS-$(ARCH_X86) += x86/cpu.o
 
-TESTPROGS = adler32 aes base64 cpu crc des lls md5 pca sha softfloat tree
+TESTPROGS = adler32 aes base64 cpu crc des lls md5 pca sha tree
 TESTPROGS-$(HAVE_LZO1X_999_COMPRESS) += lzo
 
 DIRS = arm bfin sh4 x86

diff --git a/libavutil/softfloat.c b/libavutil/softfloat.c
diff --git a/libavutil/softfloat.h b/libavutil/softfloat.h