vdso.7: Add y2038 compliant gettime for ppc/32

Christophe Leroy via Bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=213421

[
In ppc32 functions section, the Y2038 compliant function
__kernel_clock_gettime64() is missing.

It was added by commit d0e3fc69d00d
("powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32")
]

.../linux$ git describe d0e3fc69d00d
v5.10-rc2-76-gd0e3fc69d00d

Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/vdso.7

@@ -370,6 +370,7 @@ symbol	version
 _
 __kernel_clock_getres	LINUX_2.6.15
 __kernel_clock_gettime	LINUX_2.6.15
+__kernel_clock_gettime64	LINUX_5.10
 __kernel_datapage_offset	LINUX_2.6.15
 __kernel_get_syscall_map	LINUX_2.6.15
 __kernel_get_tbfreq	LINUX_2.6.15