audio/traverso: fix build on powerpc64 elfv2

For some reason, even though ARCH_X86 isn't defined on powerpc64, clang doesn't finish the function on #ifndef ARCH_X86, but tries to compile further and fails at x86-specific assembly.

PR:		242462
Approved by:	yuri (maintainer), mentors (implicit approval)

audio/traverso/files/patch-src_common_fpu.cc

@@ -0,0 +1,21 @@
+--- src/common/fpu.cc.orig	2019-12-05 16:58:12 UTC
++++ src/common/fpu.cc
+@@ -33,9 +33,7 @@ FPU::FPU ()
+ 
+ 	_flags = Flags (0);
+ 
+-#ifndef ARCH_X86
+-	return;
+-#endif
++#ifdef ARCH_X86
+ 	
+ #ifndef USE_X86_64_ASM
+ 	asm volatile (
+@@ -108,6 +106,7 @@ FPU::FPU ()
+ 			free (fxbuf);
+ 		}
+ 	}
++#endif
+ }			
+ 
+ FPU::~FPU ()