postinst-intercepts: always use set -e

If a postinst has a problem (say, qemu crashes) and set -e isn't in operation,
the only mention of the problem is a single line in the rootfs log that doesn't
trigger any warnings.

(From OE-Core rev: 072800f89a136bb5da44627f25599d3060cca0a1)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/postinst-intercepts/update_font_cache

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 PSEUDO_UNLOAD=1 qemuwrapper -L $D -E LD_LIBRARY_PATH=$D/${libdir}:$D/${base_libdir} \
 					-E ${fontconfigcacheenv} $D${bindir}/fc-cache --sysroot=$D --system-only ${fontconfigcacheparams}
 chown -R root:root $D${fontconfigcachedir}

scripts/postinst-intercepts/update_pixbuf_cache

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 export GDK_PIXBUF_MODULEDIR=$D${libdir}/gdk-pixbuf-2.0/2.10.0/loaders
 export GDK_PIXBUF_FATAL_LOADER=1