gcc-dev_unity_xtra warnings for Arx in branch 1.2-branch

• -Wdisabled-optimization [docs] (0 | -8)
• -Wmaybe-uninitialized [docs] (0 | -2)
• -Wconditionally-supported [docs] (1 | =)
• -Wstrict-aliasing [docs] (6 | -1)
• -Wunused-const-variable= [docs] (11 | -2)
• -Wuseless-cast [docs] (70 | -8)
• -Wold-style-cast [docs] (102 | =)
• -Wpadded [docs] (291 | +3 -3)
• -Wconversion [docs] (502 | +2)