Tests: Drop redundant string(ASCII) case from COnly test

Drop the case added by commit 8714396927 (Test conversion from ascii to
string, 2003-01-01, v2.4.0~4658).  Its results were not checked, and the
command is tested elsewhere anyway.

Tests/COnly/CMakeLists.txt

@@ -7,7 +7,5 @@ add_library(testc1 STATIC libc1.c)
 add_library(testc2 SHARED libc2.c)
 add_executable (COnly conly.c foo.c foo.h)
 target_link_libraries(COnly testc1 testc2)
-string(ASCII 35 32 67 77 97 107 101 ASCII_STRING)
-message(STATUS "String: ${ASCII_STRING}")
 
 add_library(testCModule MODULE testCModule.c)