[vcpkg] Use spaces instead of semicolons in the output

[Pospelove]

If the package build fails, we get an error message like this:

-- Building x86-windows-dbg
CMake Error at scripts/cmake/vcpkg_execute_build_process.cmake:134 (message):
    Command failed: C:/vcpkg/downloads/tools/cmake-3.14.0-windows/cmake-3.14.0-win32-x86/bin/cmake.exe;--build;.;--config;Debug;--;/p:VCPkgLocalAppDataDisabled=true;/p:UseIntelMKL=No;/m

For readability, it would be better to use spaces instead of semicolons to separate command arguments.

-- Building x86-windows-dbg
CMake Error at scripts/cmake/vcpkg_execute_build_process.cmake:135 (message):
    Command failed: C:/vcpkg/downloads/tools/cmake-3.14.0-windows/cmake-3.14.0-win32-x86/bin/cmake.exe --build . --config Debug -- /p:VCPkgLocalAppDataDisabled=true /p:UseIntelMKL=No /m

[cskrisz]

• Command arguments containing spaces should be wrapped in quotes, so we know that they are in fact, a single argument
• vcpkg_execute_required_process and vcpkg_execute_required_process_repeat should also use this format then

[Pospelove]

@cskrisz Thanks for your feedback. Please review again.

[vicroms]

Thanks for the PR!

[MVoz]

@vicroms

meson error

vcpkg_install_meson.cmake

COMMAND ${NINJA} install -v

failed
vcpkg_execute_required_process(

ok
execute_process(

old version, now I recheck

[MVoz]

false alarm
can't figure out why python gives an error

"cp" "-f" "../src/tk-doc-zip-b6950d3b86/gtkdoc/__init__.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/check.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/common.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/fixxref.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/highlight.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/md_to_db.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/mkdb.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/mkhtml.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/mkhtml2.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/mkman.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/mkpdf.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/rebase.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/scan.py" "../src/tk-doc-zip-b6950d3b86/gtkdoc/scangobj.py" "gtkdoc"
CreateProcess failed: The system cannot find the file specified.
ninja: build stopped: subcommand failed.

Apparently in this, the CP team
"cp" "-f"