kernel & addons: Build with the non-legacy GCC even on x86_gcc2h.

Only one code change: for some reason, GCC chokes on the cr3 functions
as macros (throwing errors about invalid registers.) The BSDs have them
as inline functions instead, so they are converted to that here.

Tested and working. There seems to be about a 10% decrease in CPU time
on some compilation benchmarks that I briefly tried.

Change-Id: I31666297394d7619f83fca6ff5f933ddd6f07420
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4515
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

build/jam/SystemLibraryRules

@@ -103,7 +103,7 @@ rule TargetKernelLibsupc++ asPath
 			flags += path ;
 		}
 		return [
-			BuildFeatureAttribute gcc_syslibs_devel
+			BuildFeatureAttribute QUALIFIED $(TARGET_KERNEL_ARCH):gcc_syslibs_devel
 				: libsupc++-kernel.a : $(flags)
 		] ;
 	} else {
@@ -215,7 +215,7 @@ rule TargetKernelLibgcc asPath
 			flags += path ;
 		}
 		return [
-			BuildFeatureAttribute gcc_syslibs_devel
+			BuildFeatureAttribute QUALIFIED $(TARGET_KERNEL_ARCH):gcc_syslibs_devel
 				: libgcc-kernel.a : $(flags)
 		] ;
 	} else {
@@ -224,15 +224,15 @@ rule TargetKernelLibgcc asPath
 }
 
 
-rule TargetBootLibgcc asPath
+rule TargetBootLibgcc architecture : asPath
 {
-	# TargetBootLibgcc [ <asPath> ]
+	# TargetBootLibgcc [ architecture ] : [ <asPath> ]
 	#
 	# Returns the static bootloader libgcc for the target.
 	# Invoking with <asPath> = true will return the full library path.
 
 	if $(TARGET_PLATFORM) = haiku {
-		if $(TARGET_PACKAGING_ARCH) = x86_64 {
+		if $(architecture) = x86_64 {
 			# we need to use the 32-bit libgcc.a built by the cross-compiler
 			return $(TARGET_BOOT_LIBGCC) ;
 
@@ -247,7 +247,7 @@ rule TargetBootLibgcc asPath
 			flags += path ;
 		}
 		return [
-			BuildFeatureAttribute gcc_syslibs_devel
+			BuildFeatureAttribute QUALIFIED $(architecture):gcc_syslibs_devel
 				: libgcc-kernel.a : $(flags)
 		] ;
 	} else {
@@ -292,7 +292,7 @@ rule TargetKernelLibgcceh asPath
 			flags += path ;
 		}
 		return [
-			BuildFeatureAttribute gcc_syslibs_devel
+			BuildFeatureAttribute QUALIFIED $(TARGET_KERNEL_ARCH):gcc_syslibs_devel
 				: libgcc_eh-kernel.a : $(flags)
 		] ;
 	} else {