thunderbird: Remove developer files

/usr/lib/thunderbird-devel-45.2.0 removed. There are Thunderbird
Development-Tools.I think, we dont need this directory.
This is 1GB.There is a switch "--disable-developer-tools"
but unfortunately the directory is still there.

thunderbird.be0

@@ -2,7 +2,7 @@
 
 #export BEE_TMP_TMPDIR=/dev/shm BEE_TMP_BUILDROOT=/dev/shm/bee-root BEE_MAKEFLAGS='-j80'
 
-# BEE_VERSION thunderbird-45.2.0-0
+# BEE_VERSION thunderbird-45.2.0-1
 
 SRCURL[0]="https://ftp.mozilla.org/pub/thunderbird/releases/${PKGVERSION}/source/thunderbird-${PKGVERSION}.source.tar.xz"
 
@@ -74,6 +74,10 @@ mee_build_post() {
 mee_install_post() {
     install -d ${D}${LIBDIR}/mariux64
     mv ${D}${BINDIR}/${PKGNAME} ${D}${LIBDIR}/mariux64/${PKGNAME}
+
+    # remove remove unneeded thunderbird-devel
+
+    rm -r ${D}${LIBDIR}/thunderbird-devel-${PKGVERSION}
 
     # install official icon in all sizes