Rename libraries from c1 to testc1

Tests/COnly/CMakeLists.txt

 # a simple C only test case
 PROJECT (conly C)
-ADD_LIBRARY(c1 STATIC libc1.c)
-ADD_LIBRARY(c2 SHARED libc2.c)
+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 c1 c2)
+TARGET_LINK_LIBRARIES(conly testc1 testc2)
 
 STRING(ASCII 35 32 67 77 97 107 101 ASCII_STRING)
 MESSAGE(STATUS "String: ${ASCII_STRING}")