gcc warning with strict-aliasing [-Wstrict-aliasing]

[sergiomb2]

JFTR, it only happens in 3 places
RawSpeed/BitPumpMSB.h:51
RawSpeed/BitPumpMSB.h:86
RawSpeed/BitPumpMSB.h:124

rawspeed/RawSpeed/BitPumpMSB.h: In member function 'RawSpeed::uint32 RawSpeed::BitPumpMSB::peekBitsNoFill(RawSpeed::uint32)':
rawspeed/RawSpeed/BitPumpMSB.h:51:53: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
uint32 ret = (uint32)&current_buffer[shift>>3];
^
rawspeed/RawSpeed/BitPumpMSB.h: In member function 'RawSpeed::uint32 RawSpeed::BitPumpMSB::peekByteNoFill()':
rawspeed/RawSpeed/BitPumpMSB.h:86:52: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
uint32 ret = (uint32)&current_buffer[shift>>3];
^
rawspeed/RawSpeed/BitPumpMSB.h: In member function 'unsigned char RawSpeed::BitPumpMSB::getByte()':
rawspeed/RawSpeed/BitPumpMSB.h:124:54: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
uint32 ret = (uint32)&current_buffer[shift>>3];