Remove -Wno-shift-op-parentheses for fusl build

fusl/src/stdio/vfprintf.c

Index: fusl/src/stdio/vfprintf.c
diff --git a/fusl/src/stdio/vfprintf.c b/fusl/src/stdio/vfprintf.c
index 2ecf76925c97f3ee34faf03b3b23a6e5c1c2dc81..5724bf310abb50633ea80b5887e6734c799aec48 100644
--- a/fusl/src/stdio/vfprintf.c
+++ b/fusl/src/stdio/vfprintf.c
@@ -17,12 +17,12 @@
 /* Convenient bit representation for modifier flags, which all fall
  * within 31 codepoints of the space character. */
 
-#define ALT_FORM   (1U<<'#'-' ')
-#define ZERO_PAD   (1U<<'0'-' ')
-#define LEFT_ADJ   (1U<<'-'-' ')
-#define PAD_POS    (1U<<' '-' ')
-#define MARK_POS   (1U<<'+'-' ')
-#define GROUPED    (1U<<'\''-' ')
+#define ALT_FORM   (1U<<('#'-' '))
+#define ZERO_PAD   (1U<<('0'-' '))
+#define LEFT_ADJ   (1U<<('-'-' '))
+#define PAD_POS    (1U<<(' '-' '))
+#define MARK_POS   (1U<<('+'-' '))
+#define GROUPED    (1U<<('\''-' '))
 
 #define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
 
@@ -485,8 +485,8 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
 		}
 
 		/* Read modifier flags */
-		for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
-			fl |= 1U<<*s-' ';
+		for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<(*s-' '))); s++)
+			fl |= 1U<<(*s-' ');
 
 		/* Read field width */
 		if (*s=='*') {