gh-126554: ctypes: Correctly handle NULL dlsym values #131948

Job	Run time
Change detection / Compute changed files	14s
Check if generated files are up to date	4m 48s
Address sanitizer (ubuntu-24.04)	9m 35s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.0.15)	2m 38s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.1.7)	4m 13s
Check if Autoconf files are up to date	26s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.2.3)	4m 5s
Windows MSI${{ '' }}	0s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.3.2)	5m 40s
Hypothesis tests on Ubuntu	7m 55s
CIFuzz (address)	19m 26s
CIFuzz (undefined)	21m 2s
CIFuzz (memory)	20m 43s
WASI / build and test	6m 25s
Thread sanitizer / Thread sanitizer	4m 22s
Thread sanitizer (free-threading) / Thread sanitizer	8m 1s
Windows / build (arm64)	3m 6s
Windows (free-threading) / build (arm64)	3m 3s
Windows / build and test (Win32)	16m 1s
Windows (free-threading) / build and test (Win32)	24m 55s
Windows / build and test (x64)	15m 32s
Windows (free-threading) / build and test (x64)	23m 33s
Ubuntu / build and test (ubuntu-24.04)	9m 20s
Ubuntu (free-threading) / build and test (ubuntu-24.04)	11m 54s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 23s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	4m 19s
macOS / build and test (macos-13)	11m 16s
Docs / Docs	2m 2s
Docs / Doctest	28m 17s
Docs / Docs (Oldest Sphinx)	2m 7s
All required checks pass	9s
	4h 40m 30s

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