update install setup using static linkage

[epicseven-cup]

the install commands for static linkage was missing the cd command to switch directory

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[epicseven-cup]

seems like CMake no longer support features before 3.15, and build will fail if you are using CMake 4.0 >.

I used the -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to get pass this, but I think a code change to the minimum version selection of the CMake.txt should be good too.