[Tracker] patch to make it build using sun studio

[jerry tan <Jerry Tan Sun COM>]

Sun Studio compiler does not accept '-Wall' CFLAGS when build.

so add this patch to make tracker trunk build on solaris with sun studio.

Index: configure.ac
===================================================================
--- configure.ac        (revision 655)
+++ configure.ac        (working copy)
@@ -115,14 +115,17 @@
               AC_HELP_STRING([--disable-warnings], [disable GCC warnings]),,
               [enable_warnings=yes])
 
-if test "x$enable_warnings" = "xyes"; then
-   CFLAGS="\
-   -Wall \
-   -Wchar-subscripts \
-   -Wnested-externs \
-   -Wpointer-arith \
-   -Wsign-compare \
-   $CFLAGS"
+dnl Only use -Wall if we have gcc
+if test "x$GCC" = "xyes"; then
+  if test "x$enable_warnings" = "xyes"; then
+     CFLAGS="\
+     -Wall \
+     -Wchar-subscripts \
+     -Wnested-externs \
+     -Wpointer-arith \
+     -Wsign-compare \
+     $CFLAGS"
+  fi
 fi
 
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