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Add option -D option to cc1

This option allows define a variable to the user.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -401,6 +401,7 @@

 extern bool expand(char *begin, Symbol *sym);

 extern void incdir(char *dir);

 extern void outcpp(void);

+extern Symbol *defmacro(char *s);

 /*

  * Definition of global variables

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -25,10 +25,17 @@

 unsigned cppctx;

 int disexpand;

-static Symbol *

+Symbol *

 defmacro(char *s)

 {

-	return install(NS_CPP, lookup(NS_CPP, s));

+	char *p;

+	Symbol *sym;

+

+	if ((p = strchr(s, '=')) != NULL)

+		*p++='\0';

+	sym = install(NS_CPP, lookup(NS_CPP, s));

+	sym->u.s = p;

+	return sym;

 }

 void

--- a/cc1/main.c

+++ b/cc1/main.c

@@ -28,7 +28,7 @@

 usage(void)

 {

 	fprintf(stderr,

-	        "usage: %s [-E] [-Idir] [-w] [-d] [-o output] [input]\n",

+	        "usage: %s [-E] [-Dmacro[=value]] [-Idir] [-w] [-d] [-o output] [input]\n",

 	        arg0);

 	exit(1);

 }

@@ -43,6 +43,7 @@

 	arg0 = (cp = strrchr(*argv, '/')) ? cp+1 : *argv;

 	if (!strcmp(arg0, "cpp"))

 		onlycpp = 1;

+

 	for (;;) {

 	nextiter:

 		--argc, ++argv;

@@ -56,6 +57,9 @@

 			case 'E':

 				onlycpp = 1;

 				break;

+			case 'D':

+				defmacro(cp+1);

+				goto nextiter;

 			case 'd':

 				DBGON();

 				break;