fix: Make installing of shared libraries work again. (#1014)

Addresses a regression in #989.

Fixes #1013.
diff --git a/configure b/configure
index 1ebaffb..b9ee0ec 100755
--- a/configure
+++ b/configure
@@ -763,8 +763,8 @@
 ac_user_opts='
 enable_option_checking
 enable_static_bin
-enable_shared
 enable_silent_rules
+enable_shared
 enable_static
 with_pic
 enable_fast_install
@@ -1407,9 +1407,9 @@
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --enable-static-bin     link iperf3 binary statically
-  --enable-shared[=PKGS]  build shared libraries [default=no]
   --enable-silent-rules   less verbose build output (undo: "make V=1")
   --disable-silent-rules  verbose build output (undo: "make V=0")
+  --enable-shared[=PKGS]  build shared libraries [default=yes]
   --enable-static[=PKGS]  build static libraries [default=yes]
   --enable-fast-install[=PKGS]
                           optimize for fast installation [default=yes]
@@ -2293,38 +2293,9 @@
 # Also link binaries as static
 # Check whether --enable-static-bin was given.
 if test "${enable_static_bin+set}" = set; then :
-  enableval=$enable_static_bin; enable_static_bin=yes
-     # Check whether --enable-shared was given.
-if test "${enable_shared+set}" = set; then :
-  enableval=$enable_shared; p=${PACKAGE-default}
-    case $enableval in
-    yes) enable_shared=yes ;;
-    no) enable_shared=no ;;
-    *)
-      enable_shared=no
-      # Look at the argument we got.  We use all the common list separators.
-      lt_save_ifs=$IFS; IFS=$IFS$PATH_SEPARATOR,
-      for pkg in $enableval; do
-	IFS=$lt_save_ifs
-	if test "X$pkg" = "X$p"; then
-	  enable_shared=yes
-	fi
-      done
-      IFS=$lt_save_ifs
-      ;;
-    esac
-else
-  enable_shared=no
-fi
-
-
-
-
-
-
-
-
-
+  enableval=$enable_static_bin; enable_static=yes
+     enable_shared=no
+     enable_static_bin=yes
 else
   :
 fi
@@ -7824,6 +7795,36 @@
   enable_win32_dll=no
 
 
+            # Check whether --enable-shared was given.
+if test "${enable_shared+set}" = set; then :
+  enableval=$enable_shared; p=${PACKAGE-default}
+    case $enableval in
+    yes) enable_shared=yes ;;
+    no) enable_shared=no ;;
+    *)
+      enable_shared=no
+      # Look at the argument we got.  We use all the common list separators.
+      lt_save_ifs=$IFS; IFS=$IFS$PATH_SEPARATOR,
+      for pkg in $enableval; do
+	IFS=$lt_save_ifs
+	if test "X$pkg" = "X$p"; then
+	  enable_shared=yes
+	fi
+      done
+      IFS=$lt_save_ifs
+      ;;
+    esac
+else
+  enable_shared=yes
+fi
+
+
+
+
+
+
+
+
 
   # Check whether --enable-static was given.
 if test "${enable_static+set}" = set; then :
@@ -14769,9 +14770,9 @@
 sed_quote_subst='$sed_quote_subst'
 double_quote_subst='$double_quote_subst'
 delay_variable_subst='$delay_variable_subst'
-enable_shared='`$ECHO "$enable_shared" | $SED "$delay_single_quote_subst"`'
 macro_version='`$ECHO "$macro_version" | $SED "$delay_single_quote_subst"`'
 macro_revision='`$ECHO "$macro_revision" | $SED "$delay_single_quote_subst"`'
+enable_shared='`$ECHO "$enable_shared" | $SED "$delay_single_quote_subst"`'
 enable_static='`$ECHO "$enable_static" | $SED "$delay_single_quote_subst"`'
 pic_mode='`$ECHO "$pic_mode" | $SED "$delay_single_quote_subst"`'
 enable_fast_install='`$ECHO "$enable_fast_install" | $SED "$delay_single_quote_subst"`'
@@ -15803,13 +15804,13 @@
 
 # ### BEGIN LIBTOOL CONFIG
 
-# Whether or not to build shared libraries.
-build_libtool_libs=$enable_shared
-
 # Which release of libtool.m4 was used?
 macro_version=$macro_version
 macro_revision=$macro_revision
 
+# Whether or not to build shared libraries.
+build_libtool_libs=$enable_shared
+
 # Whether or not to build static libraries.
 build_old_libs=$enable_static