Fix Windows version resources (#4092)

Add `FileVersion`, which is a required string ([Microsoft
documentation](https://learn.microsoft.com/en-us/windows/win32/menurc/versioninfo-resource))
in the `StringFileInfo` block.
As not all required strings were present in the block, none were being
included.
Fixes #4090

After including the `FileVersion` string, all other defined strings are
now being included on executables.

File version information for `git.exe` has changed from:
```
PS C:\Program Files\Git\bin> [System.Diagnostics.FileVersionInfo]::GetVersionInfo("C:\Data\git-sdk-64\usr\src\git\git.exe") | Select-Object *

FileVersionRaw     : 2.38.1.1
ProductVersionRaw  : 2.38.1.1
Comments           :
CompanyName        :
FileBuildPart      : 1
FileDescription    :
FileMajorPart      : 2
FileMinorPart      : 38
FileName           : C:\Data\git-sdk-64\usr\src\git\git.exe
FilePrivatePart    : 1
FileVersion        :
InternalName       :
IsDebug            : False
IsPatched          : False
IsPrivateBuild     : False
IsPreRelease       : False
IsSpecialBuild     : False
Language           : English (United States)
LegalCopyright     :
LegalTrademarks    :
OriginalFilename   :
PrivateBuild       :
ProductBuildPart   : 1
ProductMajorPart   : 2
ProductMinorPart   : 38
ProductName        :
ProductPrivatePart : 1
ProductVersion     :
SpecialBuild       :
```

To the following:
```
PS C:\Program Files\Git\bin> [System.Diagnostics.FileVersionInfo]::GetVersionInfo("C:\Data\git-sdk-64\usr\src\git\git.exe") | Select-Object *

FileVersionRaw     : 2.38.1.1
ProductVersionRaw  : 2.38.1.1
Comments           :
CompanyName        : The Git Development Community
FileBuildPart      : 1
FileDescription    : Git for Windows
FileMajorPart      : 2
FileMinorPart      : 38
FileName           : C:\Data\git-sdk-64\usr\src\git\git.exe
FilePrivatePart    : 1
FileVersion        : 2.38.1.windows.1.10.g6ed65a6fab
InternalName       : git
IsDebug            : False
IsPatched          : False
IsPrivateBuild     : False
IsPreRelease       : False
IsSpecialBuild     : False
Language           : English (United States)
LegalCopyright     :
LegalTrademarks    :
OriginalFilename   : git.exe
PrivateBuild       :
ProductBuildPart   : 1
ProductMajorPart   : 2
ProductMinorPart   : 38
ProductName        : Git
ProductPrivatePart : 1
ProductVersion     : 2.38.1.windows.1.10.g6ed65a6fab
SpecialBuild       :
```

I wasn't really expecting `GIT_VERSION` to contain the Git commit, I was
hoping for just `2.38.1` or `2.38.1.1`, at least for the `FileVersion`
string.

Anybody know if it's possible to concatenate the `MAJOR`, `MINOR`,
`MICRO`, and `PATCHLEVEL` fields with dots, or if there's another
variable that can be used (with or without `PATCHLEVEL`)?
Alternatively, use the complete `GIT_VERSION` for both `FileVersion` and
`ProductVersion`.

Author: dscho

git.rc.in

@@ -12,6 +12,7 @@ BEGIN
       VALUE "OriginalFilename", "git.exe\0"
       VALUE "ProductName", "Git\0"
       VALUE "ProductVersion", "@GIT_VERSION@\0"
+      VALUE "FileVersion", "@GIT_VERSION@\0"
     END
   END