Simple patch to resolve conflict with roundup() macro

[outpaddling]

On FreeBSD 14, and possibly other platforms, roundup() is defined as a macro in sys/param.h. The patch below resolves compile issues:

--- libBigWig/bwValues.c.orig   2023-12-16 13:51:54 UTC
+++ libBigWig/bwValues.c
@@ -5,7 +5,7 @@
 #include <zlib.h>
 #include <errno.h>
 
-static uint32_t roundup(uint32_t v) {
+static uint32_t bigwig_roundup(uint32_t v) {
     v--;
     v |= v >> 1;
     v |= v >> 2;
@@ -346,7 +346,7 @@ static bwOverlappingIntervals_t *pushIntervals(bwOverl
 //Returns NULL on error, in which case o has been free()d
 static bwOverlappingIntervals_t *pushIntervals(bwOverlappingIntervals_t *o, uint32_t start, uint32_t end, float value) {
     if(o->l+1 >= o->m) {
-        o->m = roundup(o->l+1);
+        o->m = bigwig_roundup(o->l+1);
         o->start = realloc(o->start, o->m * sizeof(uint32_t));
         if(!o->start) goto error;
         o->end = realloc(o->end, o->m * sizeof(uint32_t));
@@ -366,7 +366,7 @@ static bbOverlappingEntries_t *pushBBIntervals(bbOverl
 
 static bbOverlappingEntries_t *pushBBIntervals(bbOverlappingEntries_t *o, uint32_t start, uint32_t end, char *str, int withString) {
     if(o->l+1 >= o->m) {
-        o->m = roundup(o->l+1);
+        o->m = bigwig_roundup(o->l+1);
         o->start = realloc(o->start, o->m * sizeof(uint32_t));
         if(!o->start) goto error;
         o->end = realloc(o->end, o->m * sizeof(uint32_t));