Initial QSfera import

Server/vendor/github.com/zeebo/xxh3/_compat.c

@@ -0,0 +1,39 @@
+#include "upstream/xxhash.h"
+#include <stdio.h>
+
+int main() {
+    unsigned char buf[4096];
+    for (int i = 0; i < 4096; i++) {
+        buf[i] = (unsigned char)((i+1)%251);
+    }
+
+    printf("var testVecs64 = []uint64{\n");
+    for (int i = 0; i < 4096; i++) {
+        if (i % 4 == 0) {
+            printf("\t");
+        }
+
+        uint64_t h = XXH3_64bits(buf, (size_t)i);
+        printf("0x%lx, ", h);
+
+        if (i % 4 == 3) {
+            printf("\n\t");
+        }
+    }
+    printf("}\n\n");
+
+    printf("var testVecs128 = [][2]uint64{\n");
+    for (int i = 0; i < 4096; i++) {
+        if (i % 4 == 0) {
+            printf("\t");
+        }
+
+        XXH128_hash_t h = XXH3_128bits(buf, (size_t)i);
+        printf("{0x%lx, 0x%lx}, ", h.high64, h.low64);
+
+        if (i % 4 == 3) {
+            printf("\n");
+        }
+    }
+    printf("}\n\n");
+}