test: Update target specs test for new target-c-int-width field

Author: dkl

src/test/run-make/target-specs/my-awesome-platform.json

@@ -4,6 +4,7 @@
     "llvm-target": "i686-unknown-linux-gnu",
     "target-endian": "little",
     "target-pointer-width": "32",
+    "target-c-int-width": "32",
     "arch": "x86",
     "os": "linux",
     "morestack": false

src/test/run-make/target-specs/my-incomplete-platform.json

@@ -3,6 +3,7 @@
     "linker-flavor": "gcc",
     "target-endian": "little",
     "target-pointer-width": "32",
+    "target-c-int-width": "32",
     "arch": "x86",
     "os": "foo",
     "morestack": false

src/test/run-make/target-specs/x86_64-unknown-linux-gnu.json

@@ -5,6 +5,7 @@
     "llvm-target": "x86_64-unknown-linux-gnu",
     "target-endian": "little",
     "target-pointer-width": "64",
+    "target-c-int-width": "32",
     "arch": "x86_64",
     "os": "linux",
     "morestack": false