Make inline functions conform to C99 semantics (#75)

This fixes -O0/-O1 builds (e.g. for debugging) with clang39 or later
and gcc5 or later.

See http://clang.llvm.org/compatibility.html#inline for an explanation.

code/botlib/be_aas_route.c

@@ -106,7 +106,7 @@ void AAS_RoutingInfo(void)
 // Returns:				-
 // Changes Globals:		-
 //===========================================================================
-ID_INLINE int AAS_ClusterAreaNum(int cluster, int areanum)
+static ID_INLINE int AAS_ClusterAreaNum(int cluster, int areanum)
 {
 	int side, areacluster;
 
@@ -166,7 +166,7 @@ void AAS_InitTravelFlagFromType(void)
 // Returns:				-
 // Changes Globals:		-
 //===========================================================================
-ID_INLINE int AAS_TravelFlagForType_inline(int traveltype)
+static ID_INLINE int AAS_TravelFlagForType_inline(int traveltype)
 {
 	int tfl;
 
@@ -339,7 +339,7 @@ int AAS_EnableRoutingArea(int areanum, int enable)
 // Returns:				-
 // Changes Globals:		-
 //===========================================================================
-ID_INLINE float AAS_RoutingTime(void)
+static ID_INLINE float AAS_RoutingTime(void)
 {
 	return AAS_Time();
 } //end of the function AAS_RoutingTime
@@ -379,7 +379,7 @@ int AAS_GetAreaContentsTravelFlags(int areanum)
 // Returns:				-
 // Changes Globals:		-
 //===========================================================================
-ID_INLINE int AAS_AreaContentsTravelFlags_inline(int areanum)
+static ID_INLINE int AAS_AreaContentsTravelFlags_inline(int areanum)
 {
 	return aasworld.areacontentstravelflags[areanum];
 } //end of the function AAS_AreaContentsTravelFlags