BUG: Add missing execution space annotations (#43)

Author: steppi

include/xsf/trig.h

@@ -151,14 +151,14 @@ XSF_HOST_DEVICE inline float cotdg(float x) {
     return cotdg(static_cast<double>(x));
 }
 
-inline double radian(double d, double m, double s) { return cephes::radian(d, m, s); }
+XSF_HOST_DEVICE inline double radian(double d, double m, double s) { return cephes::radian(d, m, s); }
 
-inline float radian(float d, float m, float s) {
+XSF_HOST_DEVICE inline float radian(float d, float m, float s) {
     return radian(static_cast<double>(d), static_cast<double>(m), static_cast<double>(s));
 }
 
-inline double cosm1(double x) { return cephes::cosm1(x); }
+XSF_HOST_DEVICE inline double cosm1(double x) { return cephes::cosm1(x); }
 
-inline float cosm1(float x) { return cosm1(static_cast<double>(x)); }
+XSF_HOST_DEVICE inline float cosm1(float x) { return cosm1(static_cast<double>(x)); }
 
 } // namespace xsf