cbfstool/lzma: Remove C++ remnants

The original lzma code was probably designed as a library, and had
tons of checks for __cplusplus and extern "C". They were not removed
when imported, but remove them now.

Change-Id: I4ae6e7739d191093c57130de8ae40da835e81bd1
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4835
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/cbfstool/lzma/C/LzmaEnc.h

@@ -6,10 +6,6 @@
 
 #include "Types.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #define LZMA_PROPS_SIZE 5
 
 typedef struct _CLzmaEncProps
@@ -73,8 +69,4 @@ SRes LzmaEncode(uint8_t *dest, size_t *destLen, const uint8_t *src, size_t srcLe
     const CLzmaEncProps *props, uint8_t *propsEncoded, size_t *propsSize, int writeEndMark,
     ICompressProgress *progress, ISzAlloc *alloc, ISzAlloc *allocBig);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif