Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/gmp.pc.in b/third_party/gmp/gmp.pc.in
new file mode 100644
index 0000000..bf1c799
--- /dev/null
+++ b/third_party/gmp/gmp.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+includedir=@includedir@
+libdir=@libdir@
+
+Name: @PACKAGE_NAME@
+Description: GNU Multiple Precision Arithmetic Library
+URL: https://gmplib.org
+Version: @PACKAGE_VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -lgmp