When we run configure on Windows, fixpath is used, but this causes an error if the path contains a +.

For example, when we unzip Temurin 24, the directory name created is jdk-24+36. When we specify this as the boot JDK, the following error is output and configure fails

configure: The path of BOOT_JDK_ARG, which is given as “/mnt/d/opt/jdks/temurin-24+36”, cannot be properly resolved.
configure: Please see the section “Special Considerations” in building.md.
configure: This is the error message given by fixpath:
fixpath: failure: Path '/mnt/d/opt/jdks/temurin-24+36' could not be converted to short path
configure: error: Cannot continue