tci: Fix broken build (regression)

s390x-linux-user now also uses GETPC. Instead of adding it to the list of
targets which use GETPC, the macro is now defined unconditionally.

This avoids future build regressions like this one:

  CC    s390x-linux-user/target-s390x/int_helper.o
cc1: warnings being treated as errors
qemu/target-s390x/int_helper.c: In function ‘helper_divs32’:
qemu/target-s390x/int_helper.c:47: error: implicit declaration of function ‘GETPC’
qemu/target-s390x/int_helper.c:47: error: nested extern declaration of ‘GETPC’
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

include/exec/exec-all.h

@@ -284,14 +284,8 @@ extern int tb_invalidated_flag;
 /* The return address may point to the start of the next instruction.
    Subtracting one gets us the call instruction itself.  */
 #if defined(CONFIG_TCG_INTERPRETER)
-/* Softmmu, Alpha, MIPS, SH4 and SPARC user mode emulations call GETPC().
-   For all others, GETPC remains undefined (which makes TCI a little faster. */
-# if defined(CONFIG_SOFTMMU) || \
-    defined(TARGET_ALPHA) || defined(TARGET_MIPS) || \
-    defined(TARGET_SH4) || defined(TARGET_SPARC)
 extern uintptr_t tci_tb_ptr;
-#  define GETPC() tci_tb_ptr
-# endif
+# define GETPC() tci_tb_ptr
 #elif defined(__s390__) && !defined(__s390x__)
 # define GETPC() \
     (((uintptr_t)__builtin_return_address(0) & 0x7fffffffUL) - 1)