[vcpkg-qmake] Remove unnecessary directory

[JonLiu1993]

Recently when I was using vcpkg-qmake, I found that a function in the ports/vcpkg-qmake/vcpkg_qmake_configure.cmake file was repeated:

vcpkg/ports/vcpkg-qmake/vcpkg_qmake_configure.cmake

Line 143 in be9eb66

configure_file("${VCPKG_QT_CONF_${buildtype}}" "${CURRENT_BUILDTREES_DIR}/${config_triplet}/qt.conf")

By running this line of code, we will configure the generated qt.conf file. At the same time, if the ${CURRENT_BUILDTREES_DIR}/${config_triplet}/ path does not exist, we will also generate it.
Then we back up the environment variables and run the code

vcpkg/ports/vcpkg-qmake/vcpkg_qmake_configure.cmake

Line 149 in be9eb66

file(MAKE_DIRECTORY "${CURRENT_BUILDTREES_DIR}/${config_triplet}")

to generate the existing path above.

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

[BillyONeal]

Thanks :)