Revert "Add natives to check for NULL_VECTOR and NULL_STRING"

plugins/include/core.inc

@@ -143,22 +143,6 @@ struct SharedPlugin
 public float NULL_VECTOR[3];		/**< Pass this into certain functions to act as a C++ NULL */
 public const char NULL_STRING[1];	/**< pass this into certain functions to act as a C++ NULL */
 
-/**
- * Check if the given vector is the NULL_VECTOR.
- *
- * @param vec     The vector to test.
- * @return        True if NULL_VECTOR, false otherwise.
- */
-native bool IsNullVector(const float vec[3]);
-
-/**
- * Check if the given string is the NULL_STRING.
- *
- * @param str     The string to test.
- * @return        True if NULL_STRING, false otherwise.
- */
-native bool IsNullString(const char[] str);
-
 /**
  * Horrible compatibility shim.
  */

plugins/include/functions.inc

@@ -290,16 +290,6 @@ native void Call_PushArray(const any[] value, int size);
  */
 native void Call_PushArrayEx(any[] value, int size, int cpflags);
 
-/**
- * Pushes the NULL_VECTOR onto the current call.
- * @see IsNullVector
- *
- * @note Cannot be used before a call has been started.
- *
- * @error					Called before a call has been started.
- */
-native void Call_PushNullVector();
-
 /**
  * Pushes a string onto the current call.
  *
@@ -327,16 +317,6 @@ native void Call_PushString(const char[] value);
  */
 native void Call_PushStringEx(char[] value, int length, int szflags, int cpflags);
 
-/**
- * Pushes the NULL_STRING onto the current call.
- * @see IsNullString
- *
- * @note Cannot be used before a call has been started.
- *
- * @error					Called before a call has been started.
- */
-native void Call_PushNullString();
-
 /**
  * Completes a call to a function or forward's call list.
  *
@@ -485,22 +465,6 @@ native int GetNativeArray(int param, any[] local, int size);
  */
 native int SetNativeArray(int param, const any[] local, int size);
 
-/**
- * Check if the native parameter is the NULL_VECTOR.
- *
- * @param param		Parameter number, starting from 1.
- * @return        True if NULL_VECTOR, false otherwise.
- */
-native bool IsNativeParamNullVector(int param);
-
-/**
- * Check if the native parameter is the NULL_STRING.
- *
- * @param param		Parameter number, starting from 1.
- * @return        True if NULL_STRING, false otherwise.
- */
-native bool IsNativeParamNullString(int param);
-
 /**
  * Formats a string using parameters from a native.
  *