IMAGE_DEBUG_TYPE_CHECKSUMPDB version in pdb writer (#7443)
IMAGE_DEBUG_TYPE_CHECKSUMPDB version in pdb writer (#7443)

F# Compiler is emitting the incorrect minor version number for Debug Directory entry type #19 (PDB Checksum). This bug seems like either a copy/paste error or human error. 0x0100 is the correct minor version number for embedded pdb info, but 0 is the correct minor version number for pdb checksum as spec'd here: https://github.com/dotnet/corefx/blob/master/src/System.Reflection.Metadata/specs/PE-COFF.md#pdb-checksum-debug-directory-entry-type-19

This issues causes the VS Debugger to ignore PDB Checksum entries in F# pdbs, which breaks NuGet.org Symbol Server scenarios for F#.
dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,cloudRoutine/FSharp.Compiler.Service,cloudRoutine/FSharp.Compiler.Service,cloudRoutine/FSharp.Compiler.Service,dsyme/fsharp,dsyme/fsharp