xash3d-fwgs: check if HAVE_TGMATH_H is set to positive value rather it's just defined

engine/common/gamma.c

@@ -15,7 +15,7 @@ GNU General Public License for more details.
 
 #include "common.h"
 #include "mathlib.h"
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif
 

public/crtlib.c

@@ -21,7 +21,7 @@ GNU General Public License for more details.
 #include <time.h>
 #include "stdio.h"
 #include "crtlib.h"
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif
 

public/mathlib.c

@@ -18,7 +18,7 @@ GNU General Public License for more details.
 #include "com_model.h"
 #include "mathlib.h"
 #include "eiface.h"
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif
 

public/mathlib.h

@@ -17,7 +17,7 @@ GNU General Public License for more details.
 #define MATHLIB_H
 
 #include <math.h>
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif
 

ref_gl/gl_beams.c

@@ -22,7 +22,7 @@ GNU General Public License for more details.
 #include "cl_tent.h"
 #include "pm_local.h"
 #include "studio.h"
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif
 

ref_gl/gl_rmain.c

@@ -19,7 +19,7 @@ GNU General Public License for more details.
 #include "beamdef.h"
 #include "particledef.h"
 #include "entity_types.h"
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif
 

ref_gl/gl_studio.c

@@ -24,7 +24,7 @@ GNU General Public License for more details.
 //#include "client.h"
 #include "pmtrace.h"
 
-#ifdef HAVE_TGMATH_H
+#if HAVE_TGMATH_H
 #include <tgmath.h>
 #endif