minizip: remove c++ comment style from include files #168

Job	Run time
Make (gcc)	1m 26s
Make (gcc, USE_STANDARD_TMPFILE=1)	1m 35s
Make (gcc, USE_SYSTEM_MINIZIP=1)	1m 24s
Make (gcc, USE_DTOA_LIBRARY=1)	1m 25s
Make (gcc, USE_NO_MD5=1)	1m 26s
Make (gcc, USE_OPENSSL_MD5=1)	1m 57s
Make (gcc, USE_MEM_FILE=1)	1m 21s
Make (clang)	1m 38s
Make (clang, USE_STANDARD_TMPFILE=1)	1m 47s
Make (clang, USE_SYSTEM_MINIZIP=1)	1m 33s
Make (clang, USE_DTOA_LIBRARY=1)	1m 55s
Make (clang, USE_NO_MD5=1)	1m 40s
Make (clang, USE_OPENSSL_MD5=1)	2m 7s
Make (clang, USE_MEM_FILE=1)	1m 45s
	22m 59s

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