CMP app: fix combination of -certout and -chainout with equal filenam… #1717

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	29m 26s
minimal (windows-2019)	8m 27s
minimal (windows-2022)	8m 45s
plain (windows-2019)	16m 18s
plain (windows-2022)	16m 28s
shared (windows-2019, win64, enable-fips)	28m 8s
shared (windows-2019, win32, --strict-warnings no-fips)	31m 25s
shared (windows-2022, win64, enable-fips)	27m 46s
shared (windows-2022, win32, --strict-warnings no-fips)	30m 35s
	3h 17m 18s

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