Remove bash-only construct from autogen.sh

autogen.sh

@@ -19,7 +19,6 @@ case $automake_version in
     *' '1.[8-9]*|*' '1.1[01234]*)
 	;;
     *)
-
 	echo "This automake version is not supported by LyX."
 	echo "LyX only supports automake 1.8 to 1.14."
 	exit 1
@@ -36,7 +35,6 @@ test "$autoversion" != "" && {
     exit 1
 }
 
-
 case $autoversion in
     *' '2.60[ab]|*' '2.6[0-9])
 	;;
@@ -85,7 +83,9 @@ else
 fi
 
 echo "Building po/POTFILES.in..."
-if (! make -s -f po/Rules-lyx srcdir=po top_srcdir=. po/POTFILES.in ); then
+if ( make -s -f po/Rules-lyx srcdir=po top_srcdir=. po/POTFILES.in ); then
+    :
+else
 	echo "Building po/POTFILES.in failed -- aborting"
 	exit 1
 fi

status.21x

@@ -246,3 +246,4 @@ What's new
 
 - Fix build with gcc 5.1 using libstdc++ with C++11 ABI.
 
+- Fix bash-ism in ./autogen.sh script.