generalize FcFontRenderPrepare supression

tools/valgrind.supp

 # Pass this file to Valgrind with "--suppressions=tools/valgrind.supp"
 
 # Third party lib, driver issues.
 {
     ati_driver_bug_1
     Memcheck:Param
     ioctl(generic)
     fun:ioctl
     ...
     obj:/usr/lib/x86_64-linux-gnu/dri/fglrx_dri.so
@@ skipping 88 matching lines @@
     ...
     fun:Fc*Add*
 }
 {
     #Same root cause as font_config_bug_2.
     #The 'leak' here is a copy of rule values, as opposed to new values.
     font_config_bug_3
     Memcheck:Leak
     fun:*alloc
     ...
-    fun:FcConfigValues
-    fun:FcConfigSubstituteWithPat
     fun:FcFontRenderPrepare
 }
 {
     zlib_bug_1
     Memcheck:Cond
     fun:inflateReset2
     fun:inflateInit2_
     fun:png_create_read_struct_2
     fun:png_create_read_struct
 }
@@ skipping 86 matching lines @@
 {
     gpu_issue_14
     Memcheck:Addr4
     fun:_ZN22GrAAConvexPathRenderer10onDrawPathERK6SkPathRK11SkStrokeRecP12GrDrawTargetb
 }
 {
     gpu_issue_15
     Memcheck:Addr2
     fun:_ZN22GrAAConvexPathRenderer10onDrawPathERK6SkPathRK11SkStrokeRecP12GrDrawTargetb
 }