fix undefined symbols and conflicts on OpenWatcom

cl_dll/hl/hl_baseentity.cpp

@@ -347,3 +347,4 @@ int CBasePlayerWeapon::ExtractClipAmmo( CBasePlayerWeapon *pWeapon ) { return 0;
 void CBasePlayerWeapon::RetireWeapon( void ) { }
 void CSoundEnt::InsertSound( int iType, const Vector &vecOrigin, int iVolume, float flDuration ) {}
 void RadiusDamage( Vector vecSrc, entvars_t *pevInflictor, entvars_t *pevAttacker, float flDamage, float flRadius, int iClassIgnore, int bitsDamageType ){}
+void CSprite::AnimateUntilDead( void ) {}

cl_dll/util.cpp

@@ -33,10 +33,10 @@
 #ifndef M_PI_F
 #define M_PI_F		(float)M_PI
 #endif
-
 extern vec3_t vec3_origin;
 
-#ifdef _MSC_VER
+// if C++ mangling differs from C symbol name
+#if defined _MSC_VER || defined __WATCOMC__
 vec3_t vec3_origin;
 #endif
 

dlls/nodes.cpp

@@ -42,10 +42,13 @@ CGraph WorldGraph;
 LINK_ENTITY_TO_CLASS( info_node, CNodeEnt )
 LINK_ENTITY_TO_CLASS( info_node_air, CNodeEnt )
 
-#if !defined _WIN32
+#ifdef __DOS__
+#include <direct.h>
+#define CreateDirectoryA(p, n) mkdir(p)
+#elif !defined _WIN32
 #include <unistd.h>
 #include <sys/stat.h>
-#define CreateDirectoryA(p, n) mkdir(p, 0777)
+#define CreateDirectoryA(p, n) mkdir(p,777)
 #endif
 
 //=========================================================

dlls/util.cpp

@@ -1729,7 +1729,7 @@ void CSaveRestoreBuffer::BufferRewind( int size )
 	m_pdata->size -= size;
 }
 
-#ifndef _WIN32
+#if !defined _WIN32 && !defined __WATCOMC__
 extern "C" {
 unsigned _rotr( unsigned val, int shift )
 {