refactor(c)!: Updated include/install paths for adbc.h #295

Job	Run time
check (macOS, adbcdrivermanager) / r-check	1m 53s
check (macOS, adbcflightsql) / r-check	1m 52s
check (macOS, adbcpostgresql) / r-check	2m 5s
check (macOS, adbcsnowflake) / r-check	2m 12s
check (macOS, adbcsqlite) / r-check	1m 53s
check (ubuntu, adbcdrivermanager) / r-check	1m 40s
check (ubuntu, adbcflightsql) / r-check	2m 30s
check (ubuntu, adbcpostgresql) / r-check	2m 20s
check (ubuntu, adbcsnowflake) / r-check	2m 30s
check (ubuntu, adbcsqlite) / r-check	2m 3s
check (windows, adbcdrivermanager) / r-check	2m 36s
check (windows, adbcflightsql) / r-check	2m 36s
check (windows, adbcpostgresql) / r-check	2m 30s
check (windows, adbcsnowflake) / r-check	2m 30s
check (windows, adbcsqlite) / r-check	2m 33s
	33m 43s

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