Add whitespace to compiler flags in long version string

[FreezyLemon]

From the reference regarding environment variables set by Cargo:

CARGO_ENCODED_RUSTFLAGS — extra flags that Cargo invokes rustc with, separated by a 0x1f character (ASCII Unit Separator).

Before:

Compiler Flags: -Ctarget-cpu=native-Clink-arg=-fuse-ld=mold

After:

Compiler Flags: -C target-cpu=native -C link-arg=-fuse-ld=mold

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f6f4969) 88.53% compared to head (94e0623) 88.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3346   +/-   ##
=======================================
  Coverage   88.53%   88.54%           
=======================================
  Files          89       89           
  Lines       28330    28334    +4     
=======================================
+ Hits        25082    25087    +5     
+ Misses       3248     3247    -1     

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[shssoichiro]

Interesting. tbh I didn't realize the previous version didn't even have a space between the different flags.