Fix splitting of compiler flags in configure.

Autoconf removes a set of [] during script translation, resulting in a wrong sed command.

configure

@@ -690,6 +690,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -783,6 +784,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1035,6 +1037,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1172,7 +1183,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1325,6 +1336,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -5489,7 +5501,7 @@ extract() {
   new_line='
 '
   # Convert " -" to "\n" if not between quotes and remove possible leading white spaces
-  string=$(echo " $*" | $SED -e "s: -:\\${new_line}:g" -e 's:"\(.*\)\n\(.*\)":\"\1 -\2":g' -e "s:'\(.*\)\n\(.*\)':\'\1 -\2':g" -e 's/^[:space:]*//')
+  string=$(echo " $*" | $SED -e "s: -:\\${new_line}:g" -e 's:"\(.*\)\n\(.*\)":\"\1 -\2":g' -e "s:'\(.*\)\n\(.*\)':\'\1 -\2':g" -e 's/^[[:space:]]*//')
   SAVEIFS=$IFS
   IFS=$(printf "\n\b")
   for i in $string; do

configure.ac

@@ -190,7 +190,7 @@ extract() {
   new_line='
 '
   # Convert " -" to "\n" if not between quotes and remove possible leading white spaces
-  string=$(echo " $*" | $SED -e "s: -:\\${new_line}:g" -e 's:"\(.*\)\n\(.*\)":\"\1 -\2":g' -e "s:'\(.*\)\n\(.*\)':\'\1 -\2':g" -e 's/^[[:space:]]*//')
+  string=$(echo " $*" | $SED -e "s: -:\\${new_line}:g" -e 's:"\(.*\)\n\(.*\)":\"\1 -\2":g' -e "s:'\(.*\)\n\(.*\)':\'\1 -\2':g" -e 's/^[[[:space:]]]*//')
   SAVEIFS=$IFS
   IFS=$(printf "\n\b")
   for i in $string; do