Remove abs() function in rack namespace, remove cmath include

include/util/common.hpp

@@ -8,7 +8,6 @@
 #include <string.h>
 #include <assert.h>
 
-#include <cmath>
 #include <string>
 #include <condition_variable>
 #include <mutex>

include/util/math.hpp

@@ -23,13 +23,6 @@ inline int clamp(int x, int minimum, int maximum) {
 	return min(max(x, minimum), maximum);
 }
 
-/** Absolute value of a
-Undefined for a == INT_MIN
-*/
-inline int abs(int a) {
-	return (a >= 0) ? a : -a;
-}
-
 /** Euclidean modulus, always returns 0 <= mod < base for positive base.
 */
 inline int eucmod(int a, int base) {
@@ -55,10 +48,6 @@ inline bool ispow2(int n) {
 // basic float functions (suffixed with "f")
 ////////////////////
 
-inline float abs(float x) {
-	return (x >= 0.0f) ? x : -x;
-}
-
 /** Returns 1.f for positive numbers and -1.f for negative numbers (including positive/negative zero) */
 inline float sgn(float x) {
 	return copysignf(1.0f, x);