in-pass-shadows: use glsllib extension

jme3-core/src/main/resources/Common/MatDefs/Light/PBRLighting.frag

@@ -2,7 +2,7 @@
 #import "Common/ShaderLib/PBR.glsllib"
 #import "Common/ShaderLib/Parallax.glsllib"
 #import "Common/ShaderLib/Lighting.glsllib"
-#import "Common/ShaderLib/InPassShadows.glsl"
+#import "Common/ShaderLib/InPassShadows.glsllib"
 
 varying vec2 texCoord;
 #ifdef SEPARATE_TEXCOORD

jme3-core/src/main/resources/Common/MatDefs/Light/PBRLighting.vert

@@ -1,7 +1,7 @@
 #import "Common/ShaderLib/GLSLCompat.glsllib"
 #import "Common/ShaderLib/Instancing.glsllib"
 #import "Common/ShaderLib/Skinning.glsllib"
-#import "Common/ShaderLib/InPassShadows.glsl"
+#import "Common/ShaderLib/InPassShadows.glsllib"
 
 
 uniform vec4 m_BaseColor;

jme3-core/src/main/resources/Common/MatDefs/Light/StaticLighting.frag

@@ -1,6 +1,6 @@
 #import "Common/ShaderLib/GLSLCompat.glsllib"
 #import "Common/ShaderLib/Lighting.glsllib"
-#import "Common/ShaderLib/InPassShadows.glsl"
+#import "Common/ShaderLib/InPassShadows.glsllib"
 #import "Common/ShaderLib/PBR.glsllib"
 
 #ifndef NUM_DIR_LIGHTS

jme3-core/src/main/resources/Common/MatDefs/Light/StaticLighting.vert

@@ -1,7 +1,7 @@
 #import "Common/ShaderLib/GLSLCompat.glsllib"
 #import "Common/ShaderLib/Skinning.glsllib"
 #import "Common/ShaderLib/Instancing.glsllib"
-#import "Common/ShaderLib/InPassShadows.glsl"
+#import "Common/ShaderLib/InPassShadows.glsllib"
 
 attribute vec3 inPosition;
 attribute vec3 inNormal;