rcc

Fix compilation on CentOS 7 #1535

Job	Run time
Collect suggests deps	22s
Smoke test: stock R	3m 35s
Check deps	0s
pkgdown	3m 46s
windows-latest (release)	8m 9s
macos-latest (release)	5m 4s
Without ${{ matrix.package }}	0s
windows-latest (4.1)	11m 33s
ubuntu-20.04 (release)	4m 15s
windows-latest (4.2)	10m 56s
ubuntu-22.04 (devel)	3m 59s
ubuntu-22.04 (release) with covr	4m 13s
ubuntu-22.04 (oldrel-1)	3m 52s
ubuntu-22.04 (oldrel-2)	4m 29s
ubuntu-22.04 (oldrel-3)	5m 13s
ubuntu-22.04 (oldrel-4)	5m 2s
macOS-latest (release) mariadb_config	5m 13s
macOS-latest (release) mysql_config	5m 51s
ubuntu-22.04 (release) MySQL server + client	3m 9s
ubuntu-22.04 (release) MariaDB server, MySQL client	3m 21s
ubuntu-22.04 (release) MySQL server, MariaDB client	4m 25s
ubuntu-22.04 (release) MariaDB server + client	3m 35s
	1h 40m 2s

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