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[lib/c] Don't assume a the CHAR_BIT value

--- a/lib/c/strcspn.c

+++ b/lib/c/strcspn.c

@@ -1,3 +1,4 @@

+#include <limits.h>

 #include <string.h>

 #undef strcspn

@@ -4,7 +5,7 @@

 size_t

 strcspn(const char *s1, const char *s2)

 {

-	char buf[256];

+	char buf[sizeof(char) * CHAR_BIT];

 	unsigned char ch;

 	size_t n;

--- a/lib/c/strspn.c

+++ b/lib/c/strspn.c

@@ -1,3 +1,4 @@

+#include <limits.h>

 #include <string.h>

 #undef strspn

@@ -4,7 +5,7 @@

 size_t

 strspn(const char *s1, const char *s2)

 {

-	char buf[256];

+	char buf[sizeof(char) * CHAR_BIT];

 	unsigned char ch;

 	size_t n;