Update maketgz for macOS (libssh2#543)

File:
maketgz

Notes:
Fix error on macOS: sed: -e: No such file or directory

Credit:
cntrump

Author: cntrump

maketgz

@@ -37,14 +37,16 @@ fi
 datestamp=`LC_TIME=C date -u`
 
 # Replace in-place version number in header file:
-sed -i -e 's/^#define LIBSSH2_VERSION .*/#define LIBSSH2_VERSION "'$libversion'"/g' \
+sed -i.bak -e 's/^#define LIBSSH2_VERSION .*/#define LIBSSH2_VERSION "'$libversion'"/g' \
     -e 's/^#define LIBSSH2_VERSION_NUM .*/#define LIBSSH2_VERSION_NUM 0x'$numeric'/g' \
     -e 's/^#define LIBSSH2_VERSION_MAJOR .*/#define LIBSSH2_VERSION_MAJOR '$major'/g' \
     -e 's/^#define LIBSSH2_VERSION_MINOR .*/#define LIBSSH2_VERSION_MINOR '$minor'/g' \
     -e 's/^#define LIBSSH2_VERSION_PATCH .*/#define LIBSSH2_VERSION_PATCH '$patch'/g' \
     -e "s/^#define LIBSSH2_TIMESTAMP .*/#define LIBSSH2_TIMESTAMP \"$datestamp\"/g" \
  $HEADER
 
+rm -f "$HEADER.bak"
+
 echo "libssh2 version $libversion"
 echo "libssh2 numerical $numeric"
 echo "datestamp $datestamp"