fixes linker issue

[gabewillen]

First thank you for the excellent library and article with detailed benchmarks. When using this header with an extern struct defined which had a map field. I was getting the following linker issue

[build] duplicate symbol '_cc_omap_post_erase_fixup' in:
[build]     /VSCode/cc-cmake-issue/cmake-build-debug/CMakeFiles/test_cc_cmake_issue.dir/tests/test_cc_cmake_issue.c.o
[build]     libcc_cmake_issue.a[2](main.c.o)
[build] ld: 1 duplicate symbols

Changing the method signature to include static inline which matches the other function definitions resolved the issue.

[JacksonAllan]

Thanks for finding this bug! Certainly, that function should be static inline, like the others. I'll merge the pull request and issue a patch release ASAP.