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[cc1] remove per-calling name different behaviour

We don't produce a cpp binary anymore, only cc1-ARCH, so we don't need
this anymore.

--- a/cc1/main.c

+++ b/cc1/main.c

@@ -15,7 +15,7 @@

 int warnings;

 jmp_buf recover;

-static char *name, *output;

+static char *output;

 static struct items uflags;

 int onlycpp;

@@ -44,11 +44,8 @@

 static void

 usage(void)

 {

-	die(!strcmp(name, "cpp") ?

-	    "usage: cpp [-wd] [-D def[=val]]... [-U def]... [-I dir]... "

-	    "[input]" :

-	    "usage: cc1 [-Ewd] [-D def[=val]]... [-U def]... [-I dir]... "

-	    "[-o output] [input]");

+	die("usage: cc1-" ARCH " [-Ewd] [-D def[=val]]... [-U def]... "

+	    "[-I dir]... [-o output] [input]");

 }

 int

@@ -61,9 +58,6 @@

 	ilex();

 	icpp();

-	/* if run as cpp, only run the preprocessor */

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

-

 	ARGBEGIN {

 	case 'D':

 		defmacro(EARGF(usage()));

@@ -95,9 +89,6 @@

 	if (output && !freopen(output, "w", stdout))

 		die("error opening output: %s", strerror(errno));

-

-	if (!strcmp(name, "cpp"))

-		onlycpp = 1;

 	for (i = 0; i < uflags.n; ++i)

 		undefmacro(uflags.s[i]);