Support custom curl library #1748

Job	Run time
Xcode Build for iOS	41s
Lint	11s
Linux (GCC 7, 32-bit)	1m 32s
Linux (GCC 12)	7m 41s
Linux (clang 15 + asan + llvm-cov)	9m 20s
Linux (clang 15 + kcov)	25m 2s
Linux (gcc 12 + code-checker + valgrind)	6m 23s
macOS 14 (xcode llvm)	4m 35s
macOS 13 (xcode llvm)	8m 35s
macOS 14 (xcode llvm + universal)	11m 29s
macOS 15 (clang 18 + asan + llvm-cov)	14m 31s
Windows (old VS, 32-bit)	11m 42s
Windows (latest)	11m 20s
LLVM-Mingw	18m 33s
Android (API 35, NDK 27)	8m 0s
Create Release Archive	0s
	2h 19m 35s

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