[m-dev.] diff: bug fixes for aet's bytecode changes

[Bert Thompson]

|Hi Bert,
|
|Can you please review this one?

The change is fine by me.

Bert

|-----------------------------------------------------------------------------
|
|Fix a couple of bugs in Bert's recent changes to add new configuration
|variables for the bytecode.
|
|configure.in:
|	Fix a bug (missing `cv_' in some occurrences of
|	`mercury_cv_double_is_64_bits').
|
|configure.in:
|runtime/conf.h.in:
|runtime/mercury_types.in:
|	Insert `MR_' prefixes in front of the following configuration macros:
|		BIG_ENDIAN LITTLE_ENDIAN
|		FLOAT_IS_64_BITS DOUBLE_IS_64_BITS LONG_DOUBLE_IS_64_BITS
|	This avoids a name clash for `BIG_ENDIAN' and `LITTLE_ENDIAN',
|	which on Digital Unix are both defined in <machine/endian.h>,
|	which is include by <ucontext.h>, which we use.
|
|Index: conf.h.in