ORC-1751: [C++] fix syntax error in ThirdpartyToolchain #4133

Job	Run time
Javadoc generation	1m 46s
C++ format check (c++)	1m 2s
Docker debian11	18m 49s
C++ format check (tools)	19s
Java 17 and clang++ on ubuntu-20.04	18m 31s
License Check	33s
Docker debian12	19m 51s
Java 21 and clang++ on ubuntu-20.04	18m 29s
C++ Test on macOS (12)	8m 48s
Java 17 and clang++ on ubuntu-22.04	19m 39s
Docker ubuntu24	19m 42s
C++ Test on macOS (13)	7m 23s
Java 21 and clang++ on ubuntu-22.04	19m 17s
SIMD programming using C++ intrinsic functions on ubuntu-22.04	8m 59s
Docker fedora37	19m 14s
Java 17 and clang++ on ubuntu-24.04	20m 38s
C++ Test on macOS (14)	3m 40s
Docker oraclelinux9	19m 33s
Java 21 and clang++ on ubuntu-24.04	20m 22s
Java 17 and clang++ on macos-12	20m 57s
Java 21 and clang++ on macos-12	21m 33s
C++ General Test on Windows	6m 24s
Java 17 and clang++ on macos-13	21m 57s
Java 21 and clang++ on macos-13	29m 36s
C++ AVX512 Test on Windows	6m 2s
Java 17 and clang++ on macos-14	14m 45s
Java 21 and clang++ on macos-14	14m 7s
Java 17 and g++ on ubuntu-22.04	19m 28s
	6h 41m 24s

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