fix Issue 10431 - ICE(DMD 2.063) in struct.c:741 (1)
Fix issue 10388 - Compile DMD with Clang on Mac OS X.
fix issue 10788 - forward reference of enum member E from another module
fix issue 10787 - static ~this attributes position
fix Issue 4481 - ICE(glue.c,!vthis->csym) or compiles, depending on the import statements order
Merge pull request #2463 from 9rnsr/fix4481

Issue 4481 - ICE(glue.c,!vthis->csym) or compiles, depending on the import statements order
Merge pull request #2462 from hpohl/10788

[REG??] fix issue 10788 - forward reference of enum member E from another module
Merge pull request #2460 from hpohl/10787

fix issue 10787 - static ~this attributes position
Merge pull request #2454 from jacob-carlborg/clang

Fix issue 10388 - Compile DMD with Clang on Mac OS X.
Merge pull request #2452 from 9rnsr/fix10431

Issue 10431 - ICE(DMD 2.063) in struct.c:741 (1)