Fix curl version number testing to be much more friendly to non-bash shells.

Issue 8508, patch by me.  This *SHOULD* be POSIX compliant now..


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@48279 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure.ac

@@ -1033,22 +1033,13 @@ if test "${USE_CURL}" != "no"; then
    AC_PATH_TOOL([CURL], [curl-config], No)
    if test ! x"${CURL}" = xNo; then
    # check for version
-      if test "${host_os}" = "SunOS"; then
-            if [[ 0x`curl-config --vernum` -ge 0x70907 ]]; then
-	        CURL_INCLUDE=$(${CURL} --cflags)
-		CURL_LIB=$(${CURL} --libs)
-		PBX_CURL=1
-		AC_DEFINE([HAVE_CURL], 1, [Define if your system has the curl libraries.])
-	    fi
-	 else
-	    if [[[ 0x`curl-config --vernum` -ge 0x70907 ]]]; then
-	        CURL_INCLUDE=$(${CURL} --cflags)
-		CURL_LIB=$(${CURL} --libs)
-		PBX_CURL=1
-		AC_DEFINE([HAVE_CURL], 1, [Define if your system has the curl libraries.])
-	    fi
-	fi
-    fi
+      if test $(printf "%d" 0x$(curl-config --vernum)) -ge $(printf "%d" 0x070907); then
+         CURL_INCLUDE=$(${CURL} --cflags)
+         CURL_LIB=$(${CURL} --libs)
+         PBX_CURL=1
+         AC_DEFINE([HAVE_CURL], 1, [Define if your system has the curl libraries.])
+      fi
+   fi
 fi
 
 AC_CONFIG_FILES([build_tools/menuselect-deps makeopts channels/h323/Makefile])