[3.12] gh-127217: Fix pathname2url() for paths starting with multiple… #133652

Job	Run time
Change detection / Compute changed files	9s
Check if generated files are up to date	2m 59s
Check if Autoconf files are up to date	33s
Check if the ABI has changed	1m 47s
Address sanitizer	9m 31s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.0.15)	2m 10s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.1.7)	2m 10s
Windows MSI${{ '' }}	0s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.2.3)	2m 8s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.3.2)	2m 9s
Docs	0s
Hypothesis tests on Ubuntu	4m 29s
Thread sanitizer / Thread sanitizer	4m 29s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	6m 15s
macOS / build and test (macos-13)	11m 24s
Windows / build (arm64)	2m 24s
Windows / build and test (Win32)	17m 15s
Windows / build and test (x64)	15m 3s
Ubuntu / build and test (ubuntu-22.04)	7m 31s
All required checks pass	2s
	1h 32m 28s

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