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[libc] Do not use () in ctype macros

The parenthesis are unneded in this case because it
is impossible to have any precedence problem in this context.

--- a/lib/c/include/ctype.h

+++ b/lib/c/include/ctype.h

@@ -30,17 +30,17 @@

 extern unsigned char __ctype[];

 extern int __ctmp;

-#define isalnum(c)  ((__ctype+1)[(c)] & (_U|_L|_D))

-#define isalpha(c)  ((__ctype+1)[(c)] & (_U|_L))

-#define iscntrl(c)  ((__ctype+1)[(c)] & (_C))

-#define isdigit(c)  ((__ctype+1)[(c)] & (_D))

-#define isgraph(c)  ((__ctype+1)[(c)] & (_P|_U|_L|_D))

-#define islower(c)  ((__ctype+1)[(c)] & (_L))

-#define isprint(c)  ((__ctype+1)[(c)] & (_P|_U|_L|_D|_SP))

-#define ispunct(c)  ((__ctype+1)[(c)] & (_P))

-#define isspace(c)  ((__ctype+1)[(c)] & (_S))

-#define isupper(c)  ((__ctype+1)[(c)] & (_U))

-#define isxdigit(c) ((__ctype+1)[(c)] & (_D|_X))

+#define isalnum(c)  ((__ctype+1)[c] & (_U|_L|_D))

+#define isalpha(c)  ((__ctype+1)[c] & (_U|_L))

+#define iscntrl(c)  ((__ctype+1)[c] & (_C))

+#define isdigit(c)  ((__ctype+1)[c] & (_D))

+#define isgraph(c)  ((__ctype+1)[c] & (_P|_U|_L|_D))

+#define islower(c)  ((__ctype+1)[c] & (_L))

+#define isprint(c)  ((__ctype+1)[c] & (_P|_U|_L|_D|_SP))

+#define ispunct(c)  ((__ctype+1)[c] & (_P))

+#define isspace(c)  ((__ctype+1)[c] & (_S))

+#define isupper(c)  ((__ctype+1)[c] & (_U))

+#define isxdigit(c) ((__ctype+1)[c] & (_D|_X))

 #define tolower(c) ((__ctmp=c, isupper(__ctmp) ? __ctmp | 0x20 : __ctmp))

 #define toupper(c) ((__ctmp=c, islower(__ctmp) ? __ctmp & ~0x20 : __ctmp))