Tweak resultmap so that geometry regress test selects the right comparison

file on LinuxPPC, which is identified by config.guess as
powerpc-unknown-linux-gnu (not ...-gnulibc1).

src/test/regress/resultmap

@@ -17,7 +17,7 @@ geometry/.*-netbsd=geometry-positive-zeros
 geometry/hppa=geometry-positive-zeros
 geometry/i.86-.*-gnulibc=geometry-i86-gnulibc
 geometry/i.86-pc-cygwin*=geometry-cygwin-precision
-geometry/powerpc-unknown-linux-gnulibc1=geometry-powerpc-linux-gnulibc1
+geometry/powerpc-unknown-linux-gnu=geometry-powerpc-linux-gnulibc1
 geometry/powerpc.*aix4=geometry-powerpc-aix4
 geometry/sparc-sun-solaris=geometry-solaris-precision
 geometry/alpha.*-linux-gnu=geometry-solaris-precision