- svchost: #ifdef _MSC_VER doesn't mean "using Microsoft's headers" anymore

- svchost: #ifdef _MSC_VER doesn't mean "using Microsoft's headers" anymore
- ddraw, imm32, msxml3, oleaut32, riched20: Include typeof.h for typeof emulation when compiling under MSVC and remove from ReactOS-generic.rbuild (this can't go to port.h as the modules do not include it).
- TCPIP: Fix a check for MSVC.
- NDIS: Don't use floating point arithmetics in kernel mode -- spotted by MSVC trying to link to ftol (gcc inlined the operation).
- SAMLIB: Use __VA_ARGS__ instead of gcc-specific macro manipulation.
- WIN32CSR: Don't use gcc-specific \% if you want % in the string -- this is incorrect and will pass a broken string to swprintf (the code seems to be uncalled though, so this shouldn't change anything). Use %% instead.
- Error out on MSVC implementation of logb -- it doesn't produce the same code as the gcc version.
- Rename gcc's float.h to gcc_float.h and use #include instead of #include_next for consistency.
- Remove leftover header guard from types.h
- Remove superfluous brackets from PSEH2->MSVC defines -- this isn't necessary anymore after 41597
- Correction to 42216: MSVC *does* let you define types in a function, but only at the top of scope. Move back the C_ASSERT into KiAcquireGuardedMutex.
- Simplify definition of alloca
- scripts.cpp: Silence unavoidable warning.
- Remove compile time warning from Uniata -- the code has been unused for 1 1/2 years and will probably remain so.

svn path=/trunk/; revision=42829