[tlbuild] portability fix for dvipng.test and ptexdir/sample.test - replace $(...) with `...`

[Vladimir Volovich]

Hi!

Hi Peter, when running checks on Solaris, 2 of them fail because they're
using #!/bin/sh and on Solaris, /bin/sh does not understand the $(...) syntax.

here is a patch which replaces it with the equivalent `...` syntax:

--- texk/dvipng/dvipng.test	(revision 18548)
+++ texk/dvipng/dvipng.test	(working copy)
@@ -3,20 +3,20 @@
 # Public domain.  Originally written by Peter Breitenlohner, 2009.
 
 get_val () {
-  res=$(kpsewhich "$@") || { echo "\"kpsewhich $@\" failed"; exit 77; }
+  res=`kpsewhich "$@"` || { echo "\"kpsewhich $@\" failed"; exit 77; }
 }
 
 get_val mktex.cnf
-TEXMFCNF=$(dirname $res)
+TEXMFCNF=`dirname $res`
 get_val psfonts.map
-TEXFONTMAPS=$(dirname $(dirname $res))//
+TEXFONTMAPS=`dirname \`dirname $res\``//
 get_val 8r.enc
-ENCFONTS=$(dirname $(dirname $res))//
+ENCFONTS=`dirname \`dirname $res\``//
 get_val --expand-var='$TEXMFMAIN'
 TEXMFMAIN=$res
 get_val --expand-var='$TEXMFDIST'
 TEXMFDIST=$res
-TEXMFLOCAL=$(kpsewhich --expand-var='$TEXMFLOCAL')
+TEXMFLOCAL=`kpsewhich --expand-var='$TEXMFLOCAL'`
 
 export TEXMFCNF TEXFONTMAPS ENCFONTS TEXMFMAIN TEXMFDIST TEXMFLOCAL
 
--- texk/web2c/ptexdir/sample.test	(revision 18548)
+++ texk/web2c/ptexdir/sample.test	(working copy)
@@ -11,6 +11,6 @@
 testdir=$srcdir/ptexdir/tests
 
 TEXMFCNF=$srcdir/../kpathsea \
-  TFMFONTS=$testdir:$(dirname $(dirname $(dirname $tfmpath)))// \
+  TFMFONTS=$testdir:`dirname \`dirname \\\`dirname $tfmpath\\\`\``// \
   ./pdvitype -show-opcodes $testdir/sample >tests/xsample.typ || exit 1
 
Best,
v.