[m4] Make sure that 'unsigned char' is passed to the isxxx() functions.
[m4]
Make sure that 'unsigned char' is passed to the isxxx() functions.


git-svn-id: 25691d43496b77c53f0b494379003863a981bfc4@21582 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

bschmalhofer/m4