enabled lavapipe for software based vulkan support

.SRCINFO

@@ -46,6 +46,7 @@ pkgbase = mesa-git
 	provides = vulkan-mesa-layer
 	provides = libva-mesa-driver
 	provides = mesa-vdpau
+	provides = mesa-vulkan
 	provides = vulkan-driver
 	provides = opengl-driver
 	provides = opencl-driver
@@ -56,6 +57,7 @@ pkgbase = mesa-git
 	conflicts = vulkan-mesa-layer
 	conflicts = libva-mesa-driver
 	conflicts = mesa-vdpau
+	conflicts = mesa-vulkan
 	source = mesa::git+https://gitlab.freedesktop.org/mesa/mesa.git
 	source = LICENSE
 	md5sums = SKIP

PKGBUILD

@@ -20,8 +20,8 @@ makedepends=('git' 'python-mako' 'xorgproto'
 depends=('libdrm' 'libxxf86vm' 'libxdamage' 'libxshmfence' 'libelf'
          'libomxil-bellagio' 'libunwind' 'libglvnd' 'wayland' 'lm_sensors' 'libclc' 'vulkan-icd-loader' 'zstd' 'expat')
 optdepends=('opengl-man-pages: for the OpenGL API man pages')
-provides=('mesa' 'opencl-mesa' 'vulkan-intel' 'vulkan-radeon' 'vulkan-mesa-layer' 'libva-mesa-driver' 'mesa-vdpau' 'vulkan-driver' 'opengl-driver' 'opencl-driver')
-conflicts=('mesa' 'opencl-mesa' 'vulkan-intel' 'vulkan-radeon' 'vulkan-mesa-layer' 'libva-mesa-driver' 'mesa-vdpau')
+provides=('mesa' 'opencl-mesa' 'vulkan-intel' 'vulkan-radeon' 'vulkan-mesa-layer' 'libva-mesa-driver' 'mesa-vdpau' 'mesa-vulkan' 'vulkan-driver' 'opengl-driver' 'opencl-driver')
+conflicts=('mesa' 'opencl-mesa' 'vulkan-intel' 'vulkan-radeon' 'vulkan-mesa-layer' 'libva-mesa-driver' 'mesa-vdpau' 'mesa-vulkan')
 url="https://www.mesa3d.org"
 license=('custom')
 source=('mesa::git+https://gitlab.freedesktop.org/mesa/mesa.git'
@@ -107,7 +107,7 @@ build () {
        -D platforms=x11,wayland \
        -D dri-drivers=i915,i965,r200,r100,nouveau \
        -D gallium-drivers=r300,r600,radeonsi,nouveau,svga,swrast,virgl,iris,zink \
-       -D vulkan-drivers=amd,intel \
+       -D vulkan-drivers=amd,intel,swrast \
        -D dri3=enabled \
        -D egl=enabled \
        -D gallium-extra-hud=true \