layer.conf: Add ttf-ipa to SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS on fontconfig

This is newly added font recipe but missed the entry here

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Lei Maohui <leimaohui@fujitsu.com>

meta-oe/conf/layer.conf

@@ -5,7 +5,7 @@
 # Therefore if you want a given layer to be considered high priority
 # for the .inc and .conf etc. then consider it adding at the beginning
 # of BBPATH. For bblayers bitbake will use BBFILES_PRIORITY to resolve
-# the recipe contention so the order of directories in BBFILES does 
+# the recipe contention so the order of directories in BBFILES does
 # not matter.
 
 # We have a conf and classes directory, append to BBPATH
@@ -81,6 +81,7 @@ SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += " \
   ttf-gentium->fontconfig \
   ttf-hunkyfonts->fontconfig \
   ttf-inconsolata->fontconfig \
+  ttf-ipa->fontconfig \
   ttf-liberation->fontconfig \
   ttf-liberation-sans-narrow->fontconfig \
   ttf-lklug->fontconfig \