LibM LibC: add fixes for Lua port.

Author: https://github.com/Mustafa32
Commit: 3ffb2ad4e0
Pull-request: https://github.com/SerenityOS/serenity/pull/143

LibM/math.cpp

@@ -95,5 +95,30 @@ double fabs(double value)
 {
     return value < 0 ? -value : value;
 }
+double log2(double )
+{
+    ASSERT_NOT_REACHED();
+}
+
+float log2f(float ){
+    ASSERT_NOT_REACHED();
 
 }
+
+long double log2l(long double ){
+    ASSERT_NOT_REACHED();
+}
+
+double frexp(double , int *){
+    ASSERT_NOT_REACHED();
+}
+
+float frexpf(float , int *){
+    ASSERT_NOT_REACHED();
+}
+
+long double frexpl(long double , int *){
+    ASSERT_NOT_REACHED();
+
+}
+}