fixup! deps: update histogram to 0.12.0

Author: aduh95

deps/histogram/src/hdr_histogram_internal.h

@@ -0,0 +1,24 @@
+/**
+ * hdr_histogram_internal.h
+ * Non-public helpers shared across library translation units (not installed,
+ * not part of the public API). Distinct from hdr_tests.h, which is for helpers
+ * used only by the test suite.
+ */
+#ifndef HDR_HISTOGRAM_INTERNAL_H
+#define HDR_HISTOGRAM_INTERNAL_H
+
+#include <hdr/hdr_histogram.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Map a recorded value to its counts[] index. Assumes value >= 0 (callers guard);
+   defined in hdr_histogram.c and used by the log codec and the packed variant. */
+int32_t counts_index_for(const struct hdr_histogram* h, int64_t value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif