ld-version: Fix it on Fedora

On Fedora 23, ld --version outputs:
GNU ld version 2.25-15.fc23

But ld-version.sh fails to parse this, so e.g.  mips build fails to
enable VDSO, printing a warning that binutils >= 2.24 is required.

To fix, teach ld-version to parse this format.

Signed-off-by: Michael S. Tsirkin <[email protected]>
Cc: [email protected]
Cc: Michal Marek <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/12023/
Signed-off-by: Ralf Baechle <[email protected]>

scripts/ld-version.sh

@@ -2,6 +2,8 @@
 # extract linker version number from stdin and turn into single number
 	{
 	gsub(".*)", "");
+	gsub(".*version ", "");
+	gsub("-.*", "");
 	split($1,a, ".");
 	print a[1]*100000000 + a[2]*1000000 + a[3]*10000 + a[4]*100 + a[5];
 	exit