build: fix error message in configure

Replace Node.js to io.js in error messages.

Fixes: https://github.com/iojs/io.js/issues/589
PR-URL: https://github.com/iojs/io.js/pull/1389
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

configure

@@ -368,7 +368,7 @@ def get_llvm_version(cc):
     proc = subprocess.Popen(shlex.split(cc) + ['-v'], stdin=subprocess.PIPE,
                             stderr=subprocess.PIPE, stdout=subprocess.PIPE)
   except OSError:
-    print '''Node.js configure error: No acceptable C compiler found!
+    print '''io.js configure error: No acceptable C compiler found!
 
         Please make sure you have a C compiler installed on your system and/or
         consider adjusting the CC environment variable if you installed
@@ -393,7 +393,7 @@ def get_gas_version(cc):
                             stdin=subprocess.PIPE, stderr=subprocess.PIPE,
                             stdout=subprocess.PIPE)
   except OSError:
-    print '''Node.js configure error: No acceptable C compiler found!
+    print '''io.js configure error: No acceptable C compiler found!
 
         Please make sure you have a C compiler installed on your system and/or
         consider adjusting the CC environment variable if you installed
@@ -451,7 +451,7 @@ def cc_macros():
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
   except OSError:
-    print '''Node.js configure error: No acceptable C compiler found!
+    print '''io.js configure error: No acceptable C compiler found!
 
         Please make sure you have a C compiler installed on your system and/or
         consider adjusting the CC environment variable if you installed