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cc: provide fake realloc() for getenv()

--- a/sys/src/cmd/cc/compat.c

+++ b/sys/src/cmd/cc/compat.c

@@ -17,11 +17,21 @@

 }

 void*

-realloc(void*, ulong)

+realloc(void *o, ulong n)

 {

-	fprint(2, "realloc called\n");

-	abort();

-	return 0;

+	ulong m;

+	void *a;

+

+	if(n == 0)

+		return nil;

+	if(o == nil)

+		return alloc(n);

+	a = alloc(n);

+	m = (char*)a - (char*)o;

+	if(m < n)

+		n = m;

+	memmove(a, o, n);

+	return a;

 }

 void

@@ -43,5 +53,10 @@

 void

 setmalloctag(void*, uintptr)

+{

+}

+

+void

+setrealloctag(void*, uintptr)

 {

 }