glibc uses 'const' in sigdescr_np(), sigabbrev_np().
Let's use it here too.

.../glibc$ grep_glibc_prototype sigdescr_np
string/string.h:469:
extern const char *sigdescr_np (int __sig) __THROW;
.../glibc$ grep_glibc_prototype sigabbrev_np
string/string.h:466:
extern const char *sigabbrev_np (int __sig) __THROW;
.../glibc$

Signed-off-by: Alejandro Colomar <redacted>
---
 man3/strsignal.3 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/man3/strsignal.3 b/man3/strsignal.3
index 6a5a1e610..bc4120303 100644
--- a/man3/strsignal.3
+++ b/man3/strsignal.3

@@ -36,8 +36,8 @@ strsignal, sigdescr_np, sigdescr_np, sys_siglist \- return string describing sig
 .B #include <string.h>
 .PP
 .BI "char *strsignal(int " sig );
-.BI "char *sigdescr_np(int " sig );
-.BI "char *sigabbrev_np(int " sig );
+.BI "const char *sigdescr_np(int " sig );
+.BI "const char *sigabbrev_np(int " sig );
 .PP
 .BI "extern const char *const " sys_siglist [];
 .fi

-- 
2.31.1