node: remove unused flags and files

Drop vestigial `process.installPrefix`, `node --vars`, NODE_CFLAGS and
NODE_PREFIX.

Also removed unused node_config.h.in (replaced with config.gypi a while back).

Author: trentm

doc/api/modules.markdown

@@ -383,7 +383,7 @@ Additionally, node will search in the following locations:
 * 3: `$PREFIX/lib/node`
 
 Where `$HOME` is the user's home directory, and `$PREFIX` is node's
-configured `installPrefix`.
+configured `node_prefix`.
 
 These are mostly for historic reasons.  You are highly encouraged to
 place your dependencies locally in `node_modules` folders.  They will be

doc/api/process.markdown

@@ -300,13 +300,6 @@ An example of the possible output looks like:
          target_arch: 'x64',
          v8_use_snapshot: 'true' } }
 
-## process.installPrefix
-
-A compiled-in property that exposes `NODE_PREFIX`.
-
-    console.log('Prefix: ' + process.installPrefix);
-
-
 ## process.kill(pid, [signal])
 
 Send a signal to a process. `pid` is the process id and `signal` is the

src/node.cc

@@ -2134,11 +2134,6 @@ Handle<Object> SetupProcessObject(int argc, char *argv[]) {
   // process.version
   process->Set(String::NewSymbol("version"), String::New(NODE_VERSION));
 
-#ifdef NODE_PREFIX
-  // process.installPrefix
-  process->Set(String::NewSymbol("installPrefix"), String::New(NODE_PREFIX));
-#endif
-
   // process.moduleLoadList
   module_load_list = Persistent<Array>::New(Array::New());
   process->Set(String::NewSymbol("moduleLoadList"), module_load_list);
@@ -2378,7 +2373,6 @@ static void PrintHelp() {
          "  -i, --interactive    always enter the REPL even if stdin\n"
          "                       does not appear to be a terminal\n"
          "  --v8-options         print v8 command line options\n"
-         "  --vars               print various compiled-in variables\n"
          "  --max-stack-size=val set max v8 stack size (bytes)\n"
          "\n"
          "Environment variables:\n"
@@ -2408,14 +2402,6 @@ static void ParseArgs(int argc, char **argv) {
     } else if (strcmp(arg, "--version") == 0 || strcmp(arg, "-v") == 0) {
       printf("%s\n", NODE_VERSION);
       exit(0);
-    } else if (strcmp(arg, "--vars") == 0) {
-#ifdef NODE_PREFIX
-      printf("NODE_PREFIX: %s\n", NODE_PREFIX);
-#endif
-#ifdef NODE_CFLAGS
-      printf("NODE_CFLAGS: %s\n", NODE_CFLAGS);
-#endif
-      exit(0);
     } else if (strstr(arg, "--max-stack-size=") == arg) {
       const char *p = 0;
       p = 1 + strchr(arg, '=');

src/node_config.h.in

@@ -19,10 +19,6 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-#if 0 /* commenting out to build via gyp faster */
-#include "node_config.h"
-#endif
-
 #ifndef NODE_VERSION_H
 #define NODE_VERSION_H