gb2313 clang warnings

[samcv]

src/strings/gb2312.c:36:118: warning: format specifies type 'unsigned char' but the argument has type 'MVMuint16'
      (aka 'unsigned short') [-Wformat]
                    MVM_exception_throw_adhoc(tc, "Error decoding gb2312 string: could not decode codepoint 0x%hhX", codepoint);
                                                                                                              ~~~~   ^~~~~~~~~
                                                                                                              %hX
src/strings/gb2312.c:132:17: warning: format specifies type 'unsigned char' but the argument has type 'MVMuint16'
      (aka 'unsigned short') [-Wformat]
                last_codepoint);
                ^~~~~~~~~~~~~~
src/strings/gb2312.c:136:17: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
                last_codepoint * 256 + codepoint);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/strings/gb2312.c:261:118: warning: format specifies type 'unsigned char' but the argument has type 'MVMCodepoint' (aka 'int')
      [-Wformat]
                    MVM_exception_throw_adhoc(tc, "Error encoding gb2312 string: could not encode codepoint 0x%hhX", codepoint);
                                                                                                              ~~~~   ^~~~~~~~~
                                                                                                              %X
compiling src/profiler/instrument.o
compiling src/profiler/log.o
compiling src/profiler/profile.o
4 warnings generated.
compiling src/profiler/heapsnapshot.o
src/strings/gb18030.c:174:26: warning: format specifies type 'unsigned char' but the argument has type 'MVMint32' (aka 'int')
      [-Wformat]
                         len4_byte1, len4_byte2, len4_byte3, len4_byte4);
                         ^~~~~~~~~~
src/strings/gb18030.c:174:38: warning: format specifies type 'unsigned char' but the argument has type 'MVMint32' (aka 'int')
      [-Wformat]
                         len4_byte1, len4_byte2, len4_byte3, len4_byte4);
                                     ^~~~~~~~~~
src/strings/gb18030.c:174:50: warning: format specifies type 'unsigned char' but the argument has type 'MVMint32' (aka 'int')
      [-Wformat]
                         len4_byte1, len4_byte2, len4_byte3, len4_byte4);
                                                 ^~~~~~~~~~
src/strings/gb18030.c:174:62: warning: format specifies type 'unsigned char' but the argument has type 'MVMint32' (aka 'int')
      [-Wformat]
                         len4_byte1, len4_byte2, len4_byte3, len4_byte4);
                                                             ^~~~~~~~~~
src/strings/gb18030.c:211:25: warning: format specifies type 'unsigned char' but the argument has type 'MVMint32' (aka 'int')
      [-Wformat]
                        last_codepoint, codepoint);
                        ^~~~~~~~~~~~~~
src/strings/gb18030.c:211:41: warning: format specifies type 'unsigned char' but the argument has type 'MVMint32' (aka 'int')
      [-Wformat]
                        last_codepoint, codepoint);
                                        ^~~~~~~~~
src/strings/gb18030.c:323:123: warning: format specifies type 'unsigned char' but the argument has type 'MVMCodepoint' (aka 'int')
      [-Wformat]
                        MVM_exception_throw_adhoc(tc, "Error encoding gb18030 string: could not encode codepoint 0x%hhX", codepoint);
                                                                                                                   ~~~~   ^~~~~~~~~
                                                                                                                   %X
compiling src/profiler/telemeh.o