Fix undefined symbols in `libpf_lib.so`

[Rayman]

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Basic Info

Info	Please fill out this column
Ticket(s) this addresses
Primary OS tested on	Ubuntu
Robotic platform tested on
Does this PR contain AI generated software?	No

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Description of contribution in a few bullet points

When I build nav2_amcl with -Wl,--no-undefined I noticed libpf_lib.so has undefined symbols. This PR correctly links libpf_lib.so to libm so all symbols can be found.

You can verify this by executing the following command:

ldd -r ./build/nav2_amcl/src/pf/libpf_lib.so
    linux-vdso.so.1 (0x00007ffd1f8c0000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x000074e909a00000)
    /lib64/ld-linux-x86-64.so.2 (0x000074e909e60000)
undefined symbol: ceil  (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: atan2 (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: sin   (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: hypot (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: cos   (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: log   (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: sqrt  (./build/nav2_amcl/src/pf/libpf_lib.so)
undefined symbol: floor (./build/nav2_amcl/src/pf/libpf_lib.so)

Description of documentation updates required from your changes

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Future work that may be required in bullet points

For Maintainers:

• [ ] Check that any new parameters added are updated in navigation.ros.org
• [ ] Check that any significant change is added to the migration guide
• [ ] Check that any new features OR changes to existing behaviors are reflected in the tuning guide
• [ ] Check that any new functions have Doxygen added
• [ ] Check that any new features have test coverage
• [ ] Check that any new plugins is added to the plugins page
• [ ] If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists

[SteveMacenski]

@Rayman please sign off with DCO bot - see the details of the action for how to resolve. Then happy to merge :-)

[Rayman]

Sorry I forgot