checksrc: exclude generated bundle files to avoid race condition #1479

Job	Run time
AmigaOS, AM gcc AmiSSL m68k	34s
AmigaOS, CM gcc AmiSSL m68k	27s
Android 21, AM openssl arm64	1m 33s
Android 21, CM openssl arm64	55s
Android 35, AM openssl arm64	1m 44s
Android 35, CM openssl arm64	54s
FreeBSD, AM clang openssl x86_64	4m 9s
Android 35, CM boringssl !zstd arm64	1m 44s
FreeBSD, AM clang openssl arm64	10m 35s
FreeBSD, CM clang openssl arm64	5m 49s
iOS, AM libressl arm64	1m 35s
iOS, CM libressl arm64	38s
MS-DOS, AM djgpp openssl i586	47s
iOS, CM-Xcode libressl arm64	4m 13s
MS-DOS, CM djgpp openssl i586	41s
NetBSD, CM clang openssl x86_64	6m 26s
OmniOS, AM gcc openssl amd64	5m 49s
OpenBSD, CM clang libressl x86_64	4m 32s
	53m 5s

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