Explicitly use sh when calling the cygwin-wrapper script as some developers are reporting that their shell can't call the script directly.

Fallout from bug #141834

configure

@@ -2844,7 +2844,7 @@ else
   echo "$ac_t""no" 1>&6
 fi
 
-for ac_prog in gawk mawk nawk awk
+for ac_prog in mawk gawk nawk awk
 do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -4706,7 +4706,7 @@ EOF
         MKSHLIB_FORCE_ALL=
         MKSHLIB_UNFORCE_ALL=
     else
-        CYGWIN_WRAPPER=${srcdir}/build/cygwin-wrapper
+        CYGWIN_WRAPPER="sh ${srcdir}/build/cygwin-wrapper"
         CC=cl
         CXX=cl
         HOST_CC=cl

configure.in

@@ -902,7 +902,7 @@ case "$target" in
         MKSHLIB_FORCE_ALL=
         MKSHLIB_UNFORCE_ALL=
     else
-        CYGWIN_WRAPPER=${srcdir}/build/cygwin-wrapper
+        CYGWIN_WRAPPER="sh ${srcdir}/build/cygwin-wrapper"
         CC=cl
         CXX=cl
         HOST_CC=cl