build: make crashpad the default backend on Linux #1194

Job	Run time
Linux (old gcc, 32-bit)	1m 18s
Xcode Build for iOS	1m 31s
Lint	15s
Linux (new gcc)	4m 13s
Linux (clang + asan + llvm-cov)	4m 55s
Linux (clang + kcov)	23m 58s
Linux (gcc + code-checker + valgrind)	5m 35s
macOS (xcode llvm)	7m 22s
macOS (xcode llvm + universal)	11m 11s
macOS (clang + asan + llvm-cov)	11m 0s
Windows (old VS, 32-bit)	6m 33s
Windows (latest)	6m 32s
LLVM-Mingw	9m 24s
Android (old API/NDK)	4m 0s
Android (new API/NDK)	6m 59s
Create Release Archive	0s
	1h 44m 46s

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