try and use less optimisation

vulkan-validation-layers.spec

@@ -44,10 +44,7 @@ developing applications that use %{name}.
 %build
 # Decrease debuginfo verbosity to reduce memory consumption even more
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
-
-%ifarch %{ix86}
-%global parallel -j1
-%endif
+%global optflags %(echo %{optflags} | sed 's/-O2 /-O1 /')
 
 %cmake3 -DCMAKE_BUILD_TYPE=Release \
         -DGLSLANG_INSTALL_DIR=%{_prefix} \
@@ -55,7 +52,7 @@ developing applications that use %{name}.
         -DUSE_ROBIN_HOOD_HASHING:BOOL=OFF \
         -DSPIRV_HEADERS_INSTALL_DIR=%{_includedir}/spirv \
         -DCMAKE_INSTALL_INCLUDEDIR=%{_includedir}/vulkan/
-%cmake_build %{?parallel}
+%cmake_build
 
 
 %install