compile_commands.json: fix bear usage #173

Job	Run time
macOS	5m 24s
windows	55s
full (lscpu)	2s
full (make -j4 O0=1 SANITIZE=1 LONG=1)	5m 32s
full (make -j4 O1=1 SANITIZE=1 LONG=1)	5m 31s
full (make -j4 Os=1 SANITIZE=1 LONG=1)	6m 57s
full (make -j4 O2=1 SANITIZE=1)	4m 15s
full (make -j4 O3=1 SANITIZE=1)	5m 43s
full (make -j4 Ofast=1 SANITIZE=1)	5m 55s
full (make -j4 O0=1 LONG=1)	2m 12s
full (make -j4 O1=1 LONG=1)	1m 11s
full (make -j4 O2=1 LONG=1)	1m 30s
full (make -j4 O3=1 LONG=1)	1m 48s
full (make -j4 Os=1 LONG=1)	1m 3s
full (make -j4 Ofast=1 LONG=1)	1m 43s
full (make -j4 CC=gcc\ -std=c99)	1m 17s
full (make -j4 CC=gcc\ -std=c11)	1m 10s
full (make -j4 CC='clang -std=c11' CXX='clang++-11 -stdlib=libc++')	2m 36s
full (make -j4 CXX='clang++-11 -std=c++2a -stdlib=libc++')	2m 40s
full (make examples SANITIZE=1)	16s
full (make perf)	42s
	58m 22s

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