bug#78029: libssh-0.11.1 fails to cross compile

[yelninei]

Hello,

Since commit b12d44dd5e35ac236bf3fbb5619b9c8c2f42c902 turned on tests and 
switchted to gexps the package no longer cross compiles, which is a dependency 
of guile-ssh (and guix).

When cross compiling to a 32bit target (tested with i586-pc-gnu) something goes 
wrong ungexp-splicing the extra CFLAGS and the literal list procedure is 
inserted for the cflags:

starting phase `configure'
source directory: "/tmp/guix-build-libssh-0.11.1.drv-0/libssh-0.11.1" (relative 
from build: "../libssh-0.11.1")
build directory: "/tmp/guix-build-libssh-0.11.1.drv-0/build"
running 'cmake' with arguments ("../libssh-0.11.1" 
"-DCMAKE_BUILD_TYPE=RelWithDebInfo" 
"-DCMAKE_INSTALL_PREFIX=/gnu/store/q1zi25van8xrzmi7gmj28rw8q9cwx7s1-libssh-0.11.1"
 "-DCMAKE_INSTALL_LIBDIR=lib" "-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=TRUE" 
"-DCMAKE_INSTALL_RPATH=/gnu/store/q1zi25van8xrzmi7gmj28rw8q9cwx7s1-libssh-0.11.1/lib"
 "-DCMAKE_VERBOSE_MAKEFILE=ON" "-DCMAKE_C_COMPILER=i586-pc-gnu-gcc" 
"-DCMAKE_CXX_COMPILER=i586-pc-gnu-g++" "-DCMAKE_SYSTEM_NAME=GNU" 
"-DWITH_GCRYPT=ON" "-DUNIT_TESTING=ON" #<procedure list _> "-DCMAKE_C_FLAGS=-g 
-O2 -Wno-incompatible-pointer-types")
error: in phase 'configure': uncaught exception:
wrong-type-arg #f "Wrong type (expecting ~A): ~S" ("string" #<procedure list 
_>) (#<procedure list _>) 


Even a 64bit target (tested with aarch64-linux-gnu) fails because it cant find 
cmocka but i assume the tests can not be run when cross compiling anyway?
CMake Error at 
/gnu/store/mnmn1rcllrimsyr9k8r9i00jqfmcrflk-cmake-minimal-cross-3.24.2/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:230
 (message):
  Could NOT find CMocka (missing: CMOCKA_LIBRARIES CMOCKA_INCLUDE_DIR)
Call Stack (most recent call first):
  
/gnu/store/mnmn1rcllrimsyr9k8r9i00jqfmcrflk-cmake-minimal-cross-3.24.2/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:594
 (_FPHSA_FAILURE_MESSAGE)
  cmake/Modules/FindCMocka.cmake:63 (find_package_handle_standard_args)
  CMakeLists.txt:59 (find_package)


There is also a deperecation warning for the gcrypt backend

-- Found GCrypt: 
/gnu/store/r02yh1bm9gbm2klmmvqy483v50rmnsw8-libgcrypt-1.11.0/include (found 
suitable version "1.11.0", minimum required is "1.5.0") 
CMake Warning at CMakeLists.txt:51 (message):
  libgcrypt cryptographic backend is deprecated and will be removed in future
  releases.

Thanks.