Exclude autogenerated files from rerun-if-changed directives

[yongqli]

Currently dependents of highs-sys will trigger a rebuild every time:

# cargo check -vv
...
       Dirty highs v1.12.0 (/Users/username/Projects/highs): the dependency highs_sys was rebuilt (1762881065.176008101s, 6s after last build at 1762881059.094095875s)
...

# cargo check -vv
...
       Dirty highs v1.12.0 (/Users/username/Projects/highs): the dependency highs_sys was rebuilt (1762881065.176008101s, 6s after last build at 1762881059.094095875s)
...

This is because some header files are autogenerated, and when bindgen parses them, bindgen::CargoCallbacks issues rerun-if-changed directives that results in files in the output dir being named as an input.

E.g.

# cargo build -vv
...
[highs-sys 1.11.0] cargo:rerun-if-changed=/Users/username/Projects/highs-sys/target/debug/build/highs-sys-1c83f0054887d3e0/out/include/highs/interfaces/highs_c_api.h
[highs-sys 1.11.0] cargo:rerun-if-changed=/Users/username/Projects/highs-sys/target/debug/build/highs-sys-1c83f0054887d3e0/out/include/highs/lp_data/HighsCallbackStruct.h
[highs-sys 1.11.0] cargo:rerun-if-changed=/Users/username/Projects/highs-sys/target/debug/build/highs-sys-1c83f0054887d3e0/out/include/highs/util/HighsInt.h
[highs-sys 1.11.0] cargo:rerun-if-changed=/Users/username/Projects/highs-sys/target/debug/build/highs-sys-1c83f0054887d3e0/out/include/highs/HConfig.h
...

This patch filters out files in the dst dir from being named in rerun-if-changed since we know that they are derived outputs and not original inputs.