Bug 5639 – allow snn.lib to be replaced by other C runtimes

Linking D .obj files and COFF files via UniLink has shown that we might run into issues with different C RTLs. And since snn.lib has to be recompiled for 64-Bit anyway, can't we remove any non-standard dependencies in the same step: Don wrote: That's pretty good. Almost all of those things are standard C. LDIV and UDIV could easily be eliminated. __except_list is a null asm label (it is FS:[0]). So the main problematic ones are: _xi_a , __acrtused_con, the __fp functions, and _Ccmp helloworld.obj(helloworld) Error 42: Symbol Undefined __acrtused_con C:\dmd\windows\bin\..\lib\phobos.lib(dmain2) Error 42: Symbol Undefined __except_list C:\dmd\windows\bin\..\lib\phobos.lib(memory) Error 42: Symbol Undefined __xi_a C:\dmd\windows\bin\..\lib\phobos.lib(lifetime) Error 42: Symbol Undefined __LDIV@ C:\dmd\windows\bin\..\lib\phobos.lib(stdio) Error 42: Symbol Undefined ___fhnd_info C:\dmd\windows\bin\..\lib\phobos.lib(conv) Error 42: Symbol Undefined __ULDIV@ C:\dmd\windows\bin\..\lib\phobos.lib(stdio) Error 42: Symbol Undefined ___fp_unlock C:\dmd\windows\bin\..\lib\phobos.lib(stdio) Error 42: Symbol Undefined ___fp_lock C:\dmd\windows\bin\..\lib\phobos.lib(ti_cfloat) Error 42: Symbol Undefined __Ccmp

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