libclc: clspv: add missing clc_isnan.cl dependency

clc_isnan.cl is needed since #124097

Author: rjodinchr

libclc/clc/lib/clspv/SOURCES

@@ -5,5 +5,6 @@
 ../generic/math/clc_nextafter.cl
 ../generic/math/clc_rint.cl
 ../generic/math/clc_trunc.cl
+../generic/relational/clc_isnan.cl
 ../generic/relational/clc_select.cl
 ../generic/shared/clc_clamp.cl