bugfix run_asn1c: make make/ninja fail on error

Functionality existed to print all output of asn1c on error, but the
form

    asn1c || cat X

makes the command exit with a 0 exit code (success). Fix by explicitly
returning non-zero exit code in this case:

    asn1c || ( cat X && false )
Signed-off-by: Robert Schmidt <robert.schmidt@openairinterface.org>

cmake_targets/macros.cmake

@@ -83,7 +83,7 @@ function(run_asn1c ASN1C_GRAMMAR ASN1C_PREFIX)
   get_filename_component(GRAMMAR_FILE ${ASN1C_GRAMMAR} NAME)
   set(LOGFILE "${CMAKE_CURRENT_BINARY_DIR}/${GRAMMAR_FILE}.log")
   add_custom_command(OUTPUT ${ASN1C_OUTPUT}
-    COMMAND ASN1C_PREFIX=${ASN1C_PREFIX} ${ASN1C_EXEC} ${ASN1C_OPTIONS} -D ${CMAKE_CURRENT_BINARY_DIR} ${ASN1C_GRAMMAR} > ${LOGFILE} 2>&1 || cat ${LOGFILE}
+    COMMAND ASN1C_PREFIX=${ASN1C_PREFIX} ${ASN1C_EXEC} ${ASN1C_OPTIONS} -D ${CMAKE_CURRENT_BINARY_DIR} ${ASN1C_GRAMMAR} > ${LOGFILE} 2>&1 || ( cat ${LOGFILE} && false )
     DEPENDS ${ASN1C_GRAMMAR}
     COMMENT "Generating ${ASN1C_COMMENT} from ${GRAMMAR_FILE}"
   )