package/lcdproc: remove freetype installation prefixes

package/lcdproc: remove freetype installation prefixes

Since [1] (freetype 2.8), freetype-config is now a wrapper of
pkg-config. So we don't need  to pass the freetype installation
prefixes on the configure command line anymore.

Setting freetype prefixes on the command line append the result
returned by pkg-config and the one provided on the command line.

FT2_CFLAGS='-I[...]/sysroot/usr/[...]/sysroot/usr/include/freetype2 -I[...]/usr/include'

This revert commit 3bdbe9abb90de0262832d5d545f239fa41fb0e91.

Fixes:
http://autobuild.buildroot.net/results/9c3/9c3f77e18ae244a2abb9ea70b6adebe215f143a6

[1] http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=1c513fbb8872bfac5631964963b6a751169a1ce6

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>