[tlbuild] some configure scripts are called without taking into account $CONFIG_SHELL

[Vladimir Volovich]

"VV" == Vladimir Volovich writes:

 VV> Please change the build system to use CONFIG_SHELL when running all
 VV> configure scripts.

it looks like the only places where configure scripts are called
"manually" (from Makefile.am) are

libs/freetype/Makefile.am:	  $(abs_srcdir)/$(FREETYPE_TREE)/configure \
libs/freetype2/Makefile.am:	  $(abs_srcdir)/$(FREETYPE_TREE)/configure \

so we just need to add $(CONFIG_SHELL) there (and inside the Build script).

Best,
v.