Remove unused Object.opEquals(Object, Object)

It was added at 1e7ddf0425050e4f184532ec1d99316c37a8b2eb, but it seems to me that had not been used entirely.
complex.c is never called
Merge pull request #469 from WalterBright/rm_complex_d

complex.c is never called
build shared object file
Merge pull request #470 from WalterBright/build-so-obj

build shared object file
Merge pull request #452 from 9rnsr/fix_opeq2

Remove unused Object.opEquals(Object, Object)
fix manifest
Merge pull request #472 from WalterBright/rm_complex_c

fix manifest
enable .so unittests for linux32

- also remove SHARED flag
Merge pull request #474 from dawgfoto/linux32UT

enable .so unittests for linux32
Fix endian issue in core.demangle

Variable `num` of type `size_t` is viewed as an array of chars.
This does not work on a big endian architecture.
Merge pull request #476 from redstar/demangle

Fix endian issue in core.demangle