ORC-1813: [C++] Fix has_null forward compatibility #4395

Job	Run time
C++ format check	9m 6s
Javadoc generation	1m 20s
Docker debian11	19m 31s
Java 17 and clang++ on ubuntu-22.04	21m 46s
Docker debian12	20m 50s
Java 21 and clang++ on ubuntu-22.04	21m 52s
License Check	30s
Docker ubuntu24	19m 29s
C++ Test on macOS (13)	14m 19s
Java 17 and clang++ on ubuntu-24.04	21m 45s
Docker fedora37	19m 49s
C++ Test on macOS (14)	4m 1s
Java 21 and clang++ on ubuntu-24.04	21m 17s
Docker oraclelinux9	19m 44s
SIMD programming using C++ intrinsic functions on ubuntu-22.04	9m 26s
Java 17 and clang++ on macos-13	29m 13s
C++ General Test on Windows	6m 11s
Java 21 and clang++ on macos-13	26m 53s
C++ AVX512 Test on Windows	7m 30s
Java 17 and clang++ on macos-14	16m 43s
Java 21 and clang++ on macos-14	14m 26s
Java 17 and clang++ on macos-15	15m 50s
Java 21 and clang++ on macos-15	15m 55s
Java 17 and g++ on ubuntu-22.04	20m 38s
	6h 18m 4s

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