haskell.compiler.*: don't build profiled libs when host == riscv64

Curiously when building a cross compiled riscv64 GHC, the libraries (for
the target) turn out way bigger than when building a riscv64 cross
compiler. Profiling libraries are not necessary for bootstrapping GHC,
so we can disable them for now. We may want to revisit this condition,
though, once we have a native bootstrapping path for riscv64-linux set
up.

pkgs/development/compilers/ghc/8.10.7.nix

@@ -32,7 +32,9 @@
 , # If enabled, use -fPIC when compiling static libs.
   enableRelocatedStaticLibs ? stdenv.targetPlatform != stdenv.hostPlatform
 
-, enableProfiledLibs ? true
+  # Exceeds Hydra output limit (at the time of writing ~3GB) when cross compiled to riscv64.
+  # A riscv64 cross-compiler fits into the limit comfortably.
+, enableProfiledLibs ? !stdenv.hostPlatform.isRiscV64
 
 , # Whether to build dynamic libs for the standard library (on the target
   # platform). Static libs are always built.

pkgs/development/compilers/ghc/common-hadrian.nix

@@ -59,7 +59,9 @@
 , # If enabled, use -fPIC when compiling static libs.
   enableRelocatedStaticLibs ? stdenv.targetPlatform != stdenv.hostPlatform
 
-, enableProfiledLibs ? true
+  # Exceeds Hydra output limit (at the time of writing ~3GB) when cross compiled to riscv64.
+  # A riscv64 cross-compiler fits into the limit comfortably.
+, enableProfiledLibs ? !stdenv.hostPlatform.isRiscV64
 
 , # Whether to build dynamic libs for the standard library (on the target
   # platform). Static libs are always built.

pkgs/development/compilers/ghc/common-make-native-bignum.nix

@@ -35,7 +35,9 @@
 , # If enabled, use -fPIC when compiling static libs.
   enableRelocatedStaticLibs ? stdenv.targetPlatform != stdenv.hostPlatform
 
-, enableProfiledLibs ? true
+  # Exceeds Hydra output limit (at the time of writing ~3GB) when cross compiled to riscv64.
+  # A riscv64 cross-compiler fits into the limit comfortably.
+, enableProfiledLibs ? !stdenv.hostPlatform.isRiscV64
 
 , # Whether to build dynamic libs for the standard library (on the target
   # platform). Static libs are always built.