libroot/os: Reshuffle stack_trace.cpp a little more.

* Add missing "generic" inclusion on x86; fixes the build there.
 * Name the file the same way as the other files in its directory.

src/system/libroot/os/arch/ppc/Jamfile

@@ -25,8 +25,9 @@ for architectureObject in [ MultiArchSubDirSetup ppc ] {
 			time.c
 			tls.c
 
+			# sources from generic
 			generic_system_time_nsecs.cpp
-			stack_trace.cpp
+			generic_stack_trace.cpp
 			;
 	}
 }

src/system/libroot/os/arch/sparc/Jamfile

@@ -25,9 +25,10 @@ for architectureObject in [ MultiArchSubDirSetup sparc ] {
 			fpu_add.c fpu_compare.c fpu_div.c fpu_explode.c fpu_implode.c
 			fpu_mul.c fpu_reg.S fpu_sqrt.c fpu_subr.c
 
+			# sources from generic
 			generic_atomic.cpp
 			generic_system_time_nsecs.cpp
-			stack_trace.cpp
+			generic_stack_trace.cpp
 			;
 	}
 }

src/system/libroot/os/arch/x86/Jamfile

@@ -10,6 +10,8 @@ for architectureObject in [ MultiArchSubDirSetup x86 x86_gcc2 ] {
 			# TODO in time.c!
 		UsePrivateSystemHeaders ;
 
+		SEARCH_SOURCE += [ FDirName $(SUBDIR) $(DOTDOT) generic ] ;
+
 		local compatibilitySources ;
 		if $(TARGET_GCC_VERSION_$(architecture)[1]) = 2 {
 			compatibilitySources =
@@ -29,7 +31,8 @@ for architectureObject in [ MultiArchSubDirSetup x86 x86_gcc2 ] {
 
 			$(compatibilitySources)
 
-			stack_trace.cpp
+			# sources from generic
+			generic_stack_trace.cpp
 			;
 	}
 }

src/system/libroot/os/arch/x86_64/Jamfile

@@ -10,9 +10,7 @@ for architectureObject in [ MultiArchSubDirSetup x86_64 ] {
 			# TODO in time.c!
 		UsePrivateSystemHeaders ;
 
-		SEARCH_SOURCE +=
+		SEARCH_SOURCE += [ FDirName $(SUBDIR) $(DOTDOT) generic ] ;
-			[ FDirName $(SUBDIR) $(DOTDOT) generic ]
-			;
 
 		MergeObject <$(architecture)>os_arch_$(TARGET_ARCH).o :
 			byteorder.S
@@ -25,7 +23,7 @@ for architectureObject in [ MultiArchSubDirSetup x86_64 ] {
 
 			# sources from generic
 			generic_atomic.cpp
-			stack_trace.cpp
+			generic_stack_trace.cpp
 			;
 	}
 }