Introducing jerry-libc's interface include directory.

jerry-core/CMakeLists.txt

@@ -144,6 +144,7 @@ project (JerryCore CXX C ASM)
                 PROPERTY COMPILE_FLAGS "${COMPILE_FLAGS_JERRY} ${CXX_FLAGS_JERRY} ${FLAGS_COMMON_${BUILD_MODE}}")
    target_compile_definitions(${TARGET_NAME}.jerry-core PRIVATE ${DEFINES_JERRY})
    target_include_directories(${TARGET_NAME}.jerry-core PRIVATE ${INCLUDE_CORE})
+   target_include_directories(${TARGET_NAME}.jerry-core SYSTEM PRIVATE ${INCLUDE_LIBC_INTERFACE})
 
    if("${BUILD_MODE}" STREQUAL "UNITTESTS")
     target_compile_definitions(${TARGET_NAME}.jerry-core INTERFACE ${DEFINES_JERRY})

jerry-core/jrt/jrt-libc-includes.h

@@ -21,33 +21,4 @@
 #include <stdlib.h>
 #include <string.h>
 
-/* Ensuring no macro implementation of functions declared in the headers are used */
-#undef isspace
-#undef isalpha
-#undef islower
-#undef isupper
-#undef isdigit
-#undef isxdigit
-#undef memset
-#undef memcmp
-#undef memcpy
-#undef memmove
-#undef strcmp
-#undef strncmp
-#undef strncpy
-#undef strlen
-#undef putchar
-#undef puts
-#undef exit
-#undef fopen
-#undef rewind
-#undef fclose
-#undef fseek
-#undef ftell
-#undef fread
-#undef fwrite
-#undef vfprintf
-#undef fprintf
-#undef printf
-
 #endif /* !JRT_LIBC_INCLUDES_H */