Change "g" (general regs) into "r" (hardregs) in clone / modify_ldt /

wine_sigaction __PIC__ cases, since "g" will not work with
-fomit-frame-pointer ("g" is referenced using %esp which was
invalidated before). Bug found and (other) fix suggested by
<daniel@mat.utfsm.cl> Daniel Serpell.

loader/signal.c

@@ -96,7 +96,7 @@ static __inline__ int wine_sigaction( int sig, struct kernel_sigaction *new,
                           "popl %%ebx"
                           : "=a" (sig)
                           : "0" (SYS_sigaction),
-                            "g" (sig),
+                            "r" (sig),
                             "c" (new),
                             "d" (old) );
 #else

memory/ldt.c

@@ -39,7 +39,7 @@ static __inline__ int modify_ldt( int func, struct modify_ldt_s *ptr,
                           "popl %%ebx"
                           : "=a" (res)
                           : "0" (SYS_modify_ldt),
-                            "g" (func),
+                            "r" (func),
                             "c" (ptr),
                             "d" (count) );
 #else

misc/port.c

@@ -88,7 +88,7 @@ int clone( int (*fn)(void *), void *stack, int flags, void *arg )
                           "xorl %%eax,%%eax\n\t"  /* Just in case it does*/
                           "0:"
                           : "=a" (ret)
-                          : "0" (SYS_clone), "g" (flags), "c" (stack_ptr) );
+                          : "0" (SYS_clone), "r" (flags), "c" (stack_ptr) );
     assert( ret );  /* If ret is 0, we returned from the child function */
     if (ret > 0) return ret;
     errno = -ret;