Look for DLLs in the environment bin path as well as the lib path

configure

@@ -13604,12 +13604,13 @@ find_lib()
     gcc_bin_path=`$CC -print-search-dirs 2>/dev/null | $FGREP programs: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`
     gcc_lib_path=`$CC -print-search-dirs 2>/dev/null | $FGREP libraries: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`
     env_lib_path=`echo $LIBS $LDFLAGS $* | sed 's/-L[ ]*//g'`
+    env_bin_path=`echo $env_lib_path | sed 's,/lib,/bin,'`
     if test "$cross_compiling" = yes; then
         host_lib_path=""
     else
         host_lib_path="$ac_default_prefix/$base_libdir $ac_default_prefix/$base_bindir /usr/$base_libdir /usr/local/$base_libdir"
     fi
-    for path in $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
+    for path in $env_bin_path $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
         lib=`ls -- $path/$1 2>/dev/null | sed 's,.*/,,' | $SORT -V -r | $AWK 'BEGIN{FS="."}{ print NF, $0 }' | $SORT -n -s | sed 's,[0-9]* ,,' | head -1`
         if test x$lib != x; then
             echo $lib

configure.ac

@@ -135,12 +135,13 @@ find_lib()
     gcc_bin_path=[`$CC -print-search-dirs 2>/dev/null | $FGREP programs: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
     gcc_lib_path=[`$CC -print-search-dirs 2>/dev/null | $FGREP libraries: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
     env_lib_path=[`echo $LIBS $LDFLAGS $* | sed 's/-L[ ]*//g'`]
+    env_bin_path=`echo $env_lib_path | sed 's,/lib,/bin,'`
     if test "$cross_compiling" = yes; then
         host_lib_path=""
     else
         host_lib_path="$ac_default_prefix/$base_libdir $ac_default_prefix/$base_bindir /usr/$base_libdir /usr/local/$base_libdir"
     fi
-    for path in $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
+    for path in $env_bin_path $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
         lib=[`ls -- $path/$1 2>/dev/null | sed 's,.*/,,' | $SORT -V -r | $AWK 'BEGIN{FS="."}{ print NF, $0 }' | $SORT -n -s | sed 's,[0-9]* ,,' | head -1`]
         if test x$lib != x; then
             echo $lib