gen_msvs_proj: write boolean for Debug attribute

Replace =1 with =true for yasm tool element. This aids in upgrading
e.g., vs9 project files to vs10.
build/x86-msvs/yasm.xml generated during conversion will require the
Separator attribute to be removed for the build to complete
successfully.

Change-Id: If75c4f9a925529740048882003e9d766c5ac4f0c

build/make/gen_msvs_proj.sh

@@ -365,7 +365,7 @@ generate_vcproj() {
                             DebugInformationFormat="1" \
                             Detect64BitPortabilityProblems="true" \
 
-                        $uses_asm && tag Tool Name="YASM"  IncludePaths="$incs" Debug="1"
+                        $uses_asm && tag Tool Name="YASM"  IncludePaths="$incs" Debug="true"
                     ;;
                     *)
                         tag Tool \
@@ -379,7 +379,7 @@ generate_vcproj() {
                             DebugInformationFormat="1" \
                             Detect64BitPortabilityProblems="true" \
 
-                        $uses_asm && tag Tool Name="YASM"  IncludePaths="$incs" Debug="1"
+                        $uses_asm && tag Tool Name="YASM"  IncludePaths="$incs" Debug="true"
                     ;;
                 esac
             ;;