The removed header includes have not been needed since #1231.
Test suggestions:
- Using Autotools-based build system:
0./autogen.sh
1./configure
2make clean-precomp
3make
- Using CMake-based build system:
0cmake -B build -DCMAKE_C_INCLUDE_WHAT_YOU_USE="include-what-you-use"
1cmake --build build --target secp256k1_precomputed