Add Stack files for different GHC versions

stack-ghc7.10.3.yaml

@@ -0,0 +1,11 @@
+resolver: lts-6.35 # ghc 7.10.3
+
+packages:
+- . # GF, PGF
+- src/runtime/haskell-bind # PGF2 (requires C runtime to be installed)
+
+extra-deps:
+
+flags:
+  gf:
+    server: true

stack-ghc8.0.2.yaml

@@ -0,0 +1,11 @@
+resolver: lts-9.21 # ghc 8.0.2
+
+packages:
+- . # GF, PGF
+- src/runtime/haskell-bind # PGF2 (requires C runtime to be installed)
+
+extra-deps:
+
+flags:
+  gf:
+    server: true

stack-ghc8.2.2.yaml

@@ -0,0 +1,14 @@
+resolver: lts-11.22 # ghc 8.2.2
+
+packages:
+- . # GF, PGF
+- src/runtime/haskell-bind # PGF2 (requires C runtime to be installed)
+
+extra-deps:
+- cgi-3001.3.0.2
+- httpd-shed-0.4.0.3
+- time-1.6.0.1 # cgi-3001.3.0.2: time-1.8.0.2 from stack configuration does not match >=1.5 && <1.7
+
+flags:
+  gf:
+    server: true

stack-ghc8.4.3.yaml

@@ -0,0 +1,12 @@
+resolver: lts-12.14 # ghc 8.4.3
+
+packages:
+- . # GF, PGF
+- src/runtime/haskell-bind # PGF2 (requires C runtime to be installed)
+
+extra-deps:
+- cgi-3001.3.0.3
+
+flags:
+  gf:
+    server: true

stack-ghc8.6.2.yaml

@@ -0,0 +1,13 @@
+resolver: nightly-2018-12-04 # ghc 8.6.2
+
+packages:
+- . # GF, PGF
+- src/runtime/haskell-bind # PGF2 (requires C runtime to be installed)
+
+extra-deps:
+- json-0.9.2
+- network-2.6.3.6
+
+flags:
+  gf:
+    server: true

stack.yaml

@@ -5,8 +5,6 @@ packages:
 - src/runtime/haskell-bind # PGF2 (requires C runtime to be installed)
 
 extra-deps:
-# - happy-1.19.9
-# - alex-3.2.4
 - cgi-3001.3.0.2
 - httpd-shed-0.4.0.3
 - time-1.6.0.1 # cgi-3001.3.0.2: time-1.8.0.2 from stack configuration does not match >=1.5 && <1.7