include libgen.h for basename API

musl has removed the non-prototype declaration of basename from string.h
[1] which now results in build errors with clang-17+ compiler

include libgen.h for using the posix declaration of the funciton.

Fixes
../git/tools/kmod.c:71:19: error: call to undeclared function 'basename'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   71 |                         "Commands:\n", basename(argv[0]));
      |                                        ^

[1] https://git.musl-libc.org/cgit/musl/commit/?id=725e17ed6dff4d0cd22487bb64470881e86a92e7
Signed-off-by: Khem Raj <raj.khem@gmail.com>

libkmod/libkmod-config.c

@@ -21,6 +21,7 @@
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
+#include <libgen.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdio.h>

shared/util.c

@@ -22,6 +22,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
+#include <libgen.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdio.h>

testsuite/testsuite.c

@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
+#include <libgen.h>
 #include <limits.h>
 #include <regex.h>
 #include <stdarg.h>

tools/depmod.c

@@ -22,6 +22,7 @@
 #include <dirent.h>
 #include <errno.h>
 #include <getopt.h>
+#include <libgen.h>
 #include <limits.h>
 #include <regex.h>
 #include <stdio.h>

tools/kmod.c

@@ -19,6 +19,7 @@
 
 #include <errno.h>
 #include <getopt.h>
+#include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>