linux_alpha pattern should allow for more-detailed machine type such

tglsfdc · tglsfdc · commit b90e3e4cbb8b · 2000-04-18T05:57:45.000Z
as 'alphaev5', cf report from Stepanov 13-Apr-00.
diff --git a/src/template/.similar b/src/template/.similar
@@ -1,5 +1,5 @@
 # Format of this file is expr-style-regular-expression=templatefilename
-alpha-unknown-linux-gnu=linux_alpha
+alpha[a-z0-9]*-unknown-linux-gnu=linux_alpha
 alpha[a-z0-9]*-dec-osf=alpha_cc
 arm-unknown-linux-gnu=linux_arm
 hppa[0-9.]*-hp-hpux=hpux_cc
