add libdrm_vc4.pc to .gitignore

Signed-off-by: Rob Clark <robclark@freedesktop.org>
diff --git a/.gitignore b/.gitignore
index c1e87c5..1b853a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,6 +56,7 @@
 libdrm_exynos.pc
 libdrm_freedreno.pc
 libdrm_amdgpu.pc
+libdrm_vc4.pc
 libkms.pc
 libtool
 ltmain.sh