Snippets for exiv2 0.28.9 from Alpine armv7

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-armv7/community/exiv2/exiv2-0.28.9-r0.log.

• /home/buildozer/aports/community/exiv2/src/exiv2-0.28.9/xmpsdk/src/XMPMeta.cpp:90:70: warning: format '%lX' expects argument of type 'long unsigned int', but argument 4 has type 'XMP_OptionBits' {aka 'unsigned int'} [-Wformat=]
     90 | #define OutProcHexInt(num)      { snprintf ( buffer, sizeof(buffer), "%lX", (num) ); /* AUDIT: Using sizeof for snprintf length is safe */      \
        |                                                                      ^~~~~  ~~~~~