Precompiled str2str doesn't always work

[Stefal]

Describe the bug On some SBC, the precompiled str2str/rtkrcv/convbin binaries doesn't work

Software/Hardware (please complete the following information):

• RTKBase release number 2.4
• OS: various
• SBC various but not Raspberry or Orange Pi Zero

See #306 Other report : Orange Pi Zero Plus : str2str: /lib/aarch64-linux-gnu/libm.so.6: versionGLIBC_2.29' not found (required by /usr/local/bin/str2str) `

Solutions:

• Be more strict when detecting platform before copying binaries
• Find a better cross compilation toolchain.

[Stefal]

Some useful documentations:

• https://opensource.com/article/20/6/linux-libraries