package/gdb: fix gnulib issue with musl and uClibc toolchains

Starting with gdb 7.11, the bundled gnulib want to use rpl_gettimeofday
(gettimeofday replacement) due bad guessing when cross-compiling with musl
and uClibc toolchains. Instead of patching gnulib configure script to fix
the test, use gl_cv_func_gettimeofday_clobber=no to not use rpl_gettimeofday.

Thanks to Thomas Petazzoni to suggest this patch.

Reported upstream:
https://sourceware.org/bugzilla/show_bug.cgi?id=19798

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gdb/gdb.mk

@@ -68,6 +68,13 @@ GDB_DISABLE_BINUTILS_CONF_OPTS = \
 	--disable-ld \
 	--disable-gas
 
+# Starting with gdb 7.11, the bundled gnulib tries to use
+# rpl_gettimeofday (gettimeofday replacement) due to the code being
+# unable to determine if the replacement function should be used or
+# not when cross-compiling with uClibc or musl as C libraries. So use
+# gl_cv_func_gettimeofday_clobber=no to not use rpl_gettimeofday,
+# assuming musl and uClibc have a properly working gettimeofday
+# implementation.
 GDB_CONF_ENV = \
 	ac_cv_type_uintptr_t=yes \
 	gt_cv_func_gettext_libintl=yes \
@@ -77,7 +84,8 @@ GDB_CONF_ENV = \
 	bash_cv_must_reinstall_sighandlers=no \
 	bash_cv_func_sigsetjmp=present \
 	bash_cv_have_mbstate_t=yes \
-	gdb_cv_func_sigsetjmp=yes
+	gdb_cv_func_sigsetjmp=yes \
+	gl_cv_func_gettimeofday_clobber=no
 
 # The shared only build is not supported by gdb, so enable static build for
 # build-in libraries with --enable-static.