contrib bunch of tiny compilers

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
laatste ronde of bugfixes

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add bison & flex to both PCC & SDCC

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
tiny fixes on SDCC

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>
add flex/Bison as proper build deps for PCC, SDCC
correct Bison dep version, add Boost as dependency for SDCC
Merge pull request #528 from boegel/contrib_bunch_of_tiny_compilers

add easyconfigs for PCC, SDCC, TCC compilers