TARGET_linux-arm: pass -fstrict-aliasing to TARGET_GLOBAL_CFLAGS

not everything is compiled with the same flags as thumb or arm

Change-Id: I2bf3910a14bd388787f95d9d3051eed2c60d0dcc
Merge "TARGET_linux-arm: pass -fstrict-aliasing to TARGET_GLOBAL_CFLAGS" into kk44