Remove strict_min_purge_interval option

Option `experimental_hpa_strict_min_purge_interval` was expected to be
temporary to simplify rollout of a bugfix. Now, when bugfix rollout is
complete it is safe to remove this option.

include/jemalloc/internal/hpa_opts.h

@@ -50,14 +50,6 @@ struct hpa_shard_opts_s {
 	 */
 	uint64_t min_purge_interval_ms;
 
-	/*
-	 * Strictly respect minimum amout of time between purges.
-	 *
-	 * This is an option to provide backward compatibility for staged rollout of
-	 * purging logic fix.
-	 */
-	bool experimental_strict_min_purge_interval;
-
 	/*
 	 * Maximum number of hugepages to purge on each purging attempt.
 	 */
@@ -83,8 +75,6 @@ struct hpa_shard_opts_s {
 	10 * 1000,							\
 	/* min_purge_interval_ms */					\
 	5 * 1000,							\
-	/* experimental_strict_min_purge_interval */			\
-	false,								\
 	/* experimental_max_purge_nhp */				\
 	-1								\
 }