Use bare install prefixes
Before this release, the installation script appended subdirectories named
after the package and version to any user-specified install prefixes so
./install.sh -p gcc -i /opt -I 6.1.0
would produce an installation directory named "/opt/gcc/6.1.0".
This differs from how most packages interpret the install prefix
and can result in redundancy if the user has already included such
information in the -i argument. With this commmit, the bare user-
-specified install prefix will be used with nothing appended. If
no -i argument is present, the default still contains the package
name and version, e.g.
./install.sh -p gcc -I 6.1.0
now generates the following installation path:
${OPENCOARRAYS_SRC_DIR}/prerequisites/installations/gcc/6.1.0