ld warns about exec stack now, making some tests fail. Fix them (and also
remove an unwarranted exec stack from libHSrts along with it).
* gnu/packages/patches/ghc-9-StgCRunAsm-only-when-needed.patch
* gnu/packages/patches/ghc-testsuite-recomp015-execstack.patch: New patches.
* gnu/local.mk (dist_patch_DATA): Register them.
* gnu/packages/haskell.scm (ghc-8.6, ghc-8.8, ghc-8.10, ghc-9.0, ghc-9.2,
ghc-9.4): Use them.
Change-Id: I8e5fc71d7394527d44ff37b1f9bd59d4971ec010
