Fix cross-compilation guesses on Solaris. * m4/fopen.m4 (gl_FUNC_FOPEN): Correct shell pattern so that it does not match "solaris2.10". * m4/open.m4 (gl_FUNC_OPEN): Likewise. * m4/printf.m4 (gl_SNPRINTF_TRUNCATION_C99, gl_SNPRINTF_DIRECTIVE_N, gl_VSNPRINTF_ZEROSIZE_C99): Likewise.