Rename compare to compare_keys in mtmergesort

Just to be more explicit

Enclave/OblivAlgs/WaksmanNetwork.tcc

@@ -1,10 +1,10 @@
 
 // #define PROFILE_MTMERGESORT
 
-template<typename T> static int compare(const void *a, const void *b);
+template<typename T> static int compare_keys(const void *a, const void *b);
 
 template<>
-int compare<uint64_t>(const void *a, const void *b)
+int compare_keys<uint64_t>(const void *a, const void *b)
 {
     uint32_t *a32 = (uint32_t*)a;
     uint32_t *b32 = (uint32_t*)b;
@@ -40,7 +40,7 @@ unsigned long start = printf_with_rtclock("begin merge(dst=%p, leftsrc=%p, Nleft
     const T* rightend = args->rightsrc + args->Nright;
 
     while (left != leftend && right != rightend) {
-        if (compare<T>(left, right) < 0) {
+        if (compare_keys<T>(left, right) < 0) {
             *dst = *left;
             ++dst;
             ++left;
@@ -79,10 +79,10 @@ static size_t binsearch(const T* src, size_t len, const T* target)
     if (len == 0) {
         return 0;
     }
-    if (compare<T>(src + left, target) > 0) {
+    if (compare_keys<T>(src + left, target) > 0) {
         return 0;
     }
-    if (len > 0 && compare<T>(src + right - 1, target) < 0) {
+    if (len > 0 && compare_keys<T>(src + right - 1, target) < 0) {
         return len;
     }
 
@@ -90,7 +90,7 @@ static size_t binsearch(const T* src, size_t len, const T* target)
     // src[len] is considered to be greater than all targets)
     while (right - left > 1) {
         size_t mid = left + (right - left)/2;
-        if (compare<T>(src + mid, target) > 0) {
+        if (compare_keys<T>(src + mid, target) > 0) {
             right = mid;
         } else {
             left = mid;
@@ -201,7 +201,7 @@ bool mtmergesort(T* buf, size_t N, T* backing, threadid_t nthreads)
 #ifdef PROFILE_MTMERGESORT
 unsigned long start = printf_with_rtclock("begin qsort(buf=%p, N=%lu)\n", buf, N);
 #endif
-        qsort(buf, N, sizeof(T), compare<T>);
+        qsort(buf, N, sizeof(T), compare_keys<T>);
 #ifdef PROFILE_MTMERGESORT
 printf_with_rtclock_diff(start, "end qsort(buf=%p, N=%lu)\n", buf, N);
 #endif