Avoid redefining "zero" as this will result in error messages like:

/opt/local/libexec/llvm-9.0/bin/../include/c++/v1/__mutex_base:397:25: error: too few arguments provided to function-like macro invocation
    if (__d <= __d.zero())
    ┆   ┆   ┆   ┆   ┆   ^
./myutils.h:359:9: note: macro 'zero' defined here
#define zero(a, n)      memset((a), 0, (n)*sizeof(a[0]))
--- src/countsort.h.orig	2021-11-23 16:01:03.000000000 -0500
+++ src/countsort.h	2021-11-23 16:01:12.000000000 -0500
@@ -20,7 +20,7 @@
 	CountSortMem()
 		{
 		m_MaxValueCount = 0;
-		zero(m_Vecs, NVEC);
+		muscle_zero(m_Vecs, NVEC);
 		}
 
 	void Free()
--- src/myutils.cpp.orig	2021-11-23 16:01:53.000000000 -0500
+++ src/myutils.cpp	2021-11-23 16:02:01.000000000 -0500
@@ -798,7 +798,7 @@
 		{
 		unsigned NewThreadStrCount = ThreadIndex + 4;
 		char **NewThreadStrs = myalloc(char *, NewThreadStrCount);
-		zero(NewThreadStrs, NewThreadStrCount);
+		muscle_zero(NewThreadStrs, NewThreadStrCount);
 		if (g_ThreadStrCount > 0)
 			memcpy(NewThreadStrs, g_ThreadStrs, g_ThreadStrCount*sizeof(char *));
 		g_ThreadStrs = NewThreadStrs;
--- src/myutils.h.orig	2021-11-23 16:02:32.000000000 -0500
+++ src/myutils.h	2021-11-23 16:02:40.000000000 -0500
@@ -356,7 +356,7 @@
 #define asserteq(x, y)	assert(feq(x, y))
 #define assertaeq(x, y)	asserta(feq(x, y))
 
-#define	zero(a, n)	memset((a), 0, (n)*sizeof(a[0]))
+#define	muscle_zero(a, n)	memset((a), 0, (n)*sizeof(a[0]))
 #define	memset_zero(a, n)	memset((a), 0, (n)*sizeof(a[0]))
 
 void ResetRand(unsigned Seed);
--- src/ensemble.cpp.orig	2021-11-23 16:03:05.000000000 -0500
+++ src/ensemble.cpp	2021-11-23 16:03:14.000000000 -0500
@@ -41,7 +41,7 @@
 	M.GetLabelToSeqIndex(Labels2, LabelToSeqIndex2);
 
 	char **szSeqsSorted = myalloc(char *, SeqCount);
-	zero(szSeqsSorted, SeqCount);
+	muscle_zero(szSeqsSorted, SeqCount);
 	for (uint SeqIndex = 0; SeqIndex < SeqCount; ++SeqIndex)
 		{
 		const string &Label = Labels2[SeqIndex];