test_x86_emulate: fix inline assembly in blowfish code

With certain gcc versions, commit 1166ecf781 ("tools/Rules.mk: Don't
optimize debug builds; add macro debugging information") results in the
file scope inline assembly no longer being emitted to the .text section
without explicitly switching to it, which causes the blowfish test to
signal SEGV.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/tools/tests/x86_emulator/blowfish.c
+++ b/tools/tests/x86_emulator/blowfish.c
@@ -21,7 +21,8 @@ Foundation, Inc., 59 Temple Place, Suite
 uint64_t blowfish_test(uint64_t input);
 
 asm (
-    ".globl _start\n"
+    "\t.text\n"
+    "\t.globl _start\n"
     "_start:\n"
 #if defined(__i386__)
     "push %edx; push %eax; "