configure.in: Move AC_C_INLINE and friends to be checked before PA_ADD_CFLAGS

Looks like -Werror=missing-declarations revealed problem in
configure: the "inline" support has not been detected properly
leading to problem in building procedure.

Lets move AC_C_INLINE and etc to be tested before gcc flags.

Reported-by: NAKAI Yuta <nak5124@live.jp>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
disasm: Add explicit type conversion to placate compiler

Otherwise getting

 | disasm.c:200:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 |         return GET_REGISTER(nasm_rd_bndreg, regval);

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
doc: Add missing closing brace

http://bugzilla.nasm.us/show_bug.cgi?id=3392284

Reported-by: Nick Rowan <nnrowan@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>