fix typo

Author: ferdymercury

cmake/modules/SearchInstalledSoftware.cmake

@@ -644,7 +644,7 @@ if(mathmore OR builtin_gsl OR (tmva-cpu AND use_gsl_cblas))
     set(GSL_INCLUDE_DIR ${CMAKE_BINARY_DIR}/GSL-prefix/src/GSL-build)
     set(GSL_FOUND ON)
     if(NOT mathmore)
-      set(mathmore ON CACHE BOOL "Enabled because builtin_gls requested (${mathmore_description})")
+      set(mathmore ON CACHE BOOL "Enabled because builtin_gsl requested (${mathmore_description})")
     endif()
   endif()
 endif()