Nimterop doesn't handle paths with spaces
```nim
import nimterop / cimport

static: cDebug()
cImport("C:/Foo Bar Baz/foo.h")
```

```
C:\Users\me\.choosenim\toolchains\nim-#devel\lib\system\fatal.nim(49, 5) Error: unhandled exception: C:\Users\me\.nimble\pkgs\nimterop-0.6.5\nimterop\cimport.nim(138, 16) `false`

# Generated @ 2020-09-21T01:23:24-05:00
# Command line:
#   C:\Users\me\.nimble\pkgs\nimterop-0.6.5\nimterop\toast.exe --preprocess -m:c --pnim --nim:C:\Users\me\.choosenim\toolchains\nim-#devel\bin\nim.exe C:\Foo Bar Baz\foo.h -o C:\Users\me\nimcache\nimterop\toastCache\nimterop_939050787.nim

toast.nim(227)           toast
cligen.nim(733)          cligenDoNotCollideWithGlobalVar
cligen.nim(651)          dispatchmain
toast.nim(150)           main
toast.nim(22)            process
getters.nim(354)         getPreprocessor
assertions.nim(29)       failedAssertImpl
assertions.nim(22)       raiseAssert
fatal.nim(49)            sysFatal
Error: unhandled exception: getters.nim(354, 18) `false`

Failed in preprocessing, check if `cIncludeDir()` is needed or compiler `mode` is correct (c/cpp)
```