Forgot that expr assumes regexp is anchored-left; therefore need .*

in front of any platform name pattern that's not supposed to match
beginning at the start of the machine type name...

src/test/regress/resultmap

 int2/hppa=int2-too-large
 int4/hppa=int4-too-large
-int2/netbsd=int2-too-large
-int4/netbsd=int4-too-large
+int2/.*-netbsd=int2-too-large
+int4/.*-netbsd=int4-too-large
 int2/i.86-pc-linux-gnulibc=int2-not-representable
 int4/i.86-pc-linux-gnulibc=int4-not-representable
 geometry/hppa=geometry-positive-zeros
-geometry/netbsd=geometry-positive-zeros
+geometry/.*-netbsd=geometry-positive-zeros
 geometry/i.86-.*-gnulibc=geometry-i86-gnulibc
 horology/hppa=horology-no-DST-before-1970