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Fix generation of intermediate code for unary - and ~

These codes were generating incorrect codes, because - was
generating code for substraction and ~ was generating code for
negation.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -46,8 +46,8 @@

 	[OADDR] = "a",

 	[ONEG] = "_",

 	[OCPL] = "~",

-	[OAND] = "m",

-	[OOR] = "s",

+	[OAND] = "y",

+	[OOR] = "o",

 	[OCOMMA] = ","

 };

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -535,8 +535,8 @@

 		return incdec(unary(), op);

 	case '!': op = 0; fun = negation; break;

 	case '+': op = OADD; fun = integeruop; break;

-	case '-': op = OSUB; fun = integeruop; break;

-	case '~': op = ONEG; fun = integeruop; break;

+	case '-': op = ONEG; fun = integeruop; break;

+	case '~': op = OCPL; fun = integeruop; break;

 	case '&': op = OADDR; fun = address; break;

 	case '*': op = OPTR; fun = content; break;

 	default: return postfix();

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -84,6 +84,9 @@

 #define OLE       '['

 #define OEQ       '='

 #define ONE       '!'

+#define OOR       'o'

+#define OAND      'y'

+#define ONEG      '_'

 extern void error(unsigned nerror, ...);

 extern void genaddable(Node *list[]);