Currently, VLA are not forbidden for static variable. This leads to
problems even if for fixed-size array when the size expression uses the
ternary operator (cond ? then-value : else-value) because it is parsed
as a general expression which leads to code generated in this case.

This commit solve the problem by forbidding VLA for static variables.
Although not required for the fix, avoiding code generation when the
expression is constant would be a nice addition though.

Error out when two local variable with same name are defined in the same
scope. This fixes bug #15597 in savannah's BTS.

Don't reset nocode_wanted with saved_nocode_wanted if it hasn't been
modified (and hence saved_nocode_wanted is uninitialized).

Add support for relocations R_ARM_THM_JUMP24 and R_ARM_THM_CALL. These
are encountered with gcc when compiling for armv6 or greater with
-mthumb flag and a call (conditional or not) is done.

Use arm hardfloat calling convention when the system is using it
(detected by searching for hardfloat multiarch directory).

Current tcc permits comparison of structs and comparison between
struct and other typed values.