Use const for pointer float array (#2807)

* Use const for pointer float array

* missed a definition

Author: planetis-m

src/rlgl.h

@@ -519,7 +519,7 @@ RLAPI void rlLoadIdentity(void);                      // Reset current matrix to
 RLAPI void rlTranslatef(float x, float y, float z);   // Multiply the current matrix by a translation matrix
 RLAPI void rlRotatef(float angle, float x, float y, float z);  // Multiply the current matrix by a rotation matrix
 RLAPI void rlScalef(float x, float y, float z);       // Multiply the current matrix by a scaling matrix
-RLAPI void rlMultMatrixf(float *matf);                // Multiply the current matrix by another matrix
+RLAPI void rlMultMatrixf(const float *matf);                // Multiply the current matrix by another matrix
 RLAPI void rlFrustum(double left, double right, double bottom, double top, double znear, double zfar);
 RLAPI void rlOrtho(double left, double right, double bottom, double top, double znear, double zfar);
 RLAPI void rlViewport(int x, int y, int width, int height); // Set the viewport area
@@ -1048,7 +1048,7 @@ void rlLoadIdentity(void) { glLoadIdentity(); }
 void rlTranslatef(float x, float y, float z) { glTranslatef(x, y, z); }
 void rlRotatef(float angle, float x, float y, float z) { glRotatef(angle, x, y, z); }
 void rlScalef(float x, float y, float z) { glScalef(x, y, z); }
-void rlMultMatrixf(float *matf) { glMultMatrixf(matf); }
+void rlMultMatrixf(const float *matf) { glMultMatrixf(matf); }
 #endif
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
 // Choose the current matrix to be transformed
@@ -1173,7 +1173,7 @@ void rlScalef(float x, float y, float z)
 }
 
 // Multiply the current matrix by another matrix
-void rlMultMatrixf(float *matf)
+void rlMultMatrixf(const float *matf)
 {
     // Matrix creation from array
     Matrix mat = { matf[0], matf[4], matf[8], matf[12],