Fix dependency on C compiler for some packages to pass cmake or configure stage (#49993)

* genfit: depend on c compiler to fix installation issues

genfit does not specify `LANGUAGES` in their `project` declaration yet, so C is also required to pass the cmake stage.

* vbfnlo: Depend on C compiler to pass configure stage

* cppunit: Depend on C compiler to pass configure stage

* Make py-pyqt5 depend on C to fix build error

* bdsim: Depend on C to pass configure stage

var/spack/repos/builtin/packages/bdsim/package.py

@@ -28,6 +28,7 @@ class Bdsim(CMakePackage):
     version("1.6.0", sha256="c0149a68d3c2436e036e8f71a13a251a2d88afe51e4387fe43ebd31a96bb3d7d")
 
     depends_on("cxx", type="build")  # generated
+    depends_on("c", type="build")
 
     depends_on("cmake")
     depends_on("geant4")

var/spack/repos/builtin/packages/cppunit/package.py

@@ -41,6 +41,7 @@ class Cppunit(AutotoolsPackage):
     )
 
     depends_on("cxx", type="build")
+    depends_on("c", type="build")
 
     depends_on("autoconf", type="build", when="@master,1.15_20220904")
     depends_on("automake", type="build", when="@master,1.15_20220904")

var/spack/repos/builtin/packages/genfit/package.py

@@ -30,7 +30,7 @@ class Genfit(CMakePackage):
     version("b496504a", sha256="e1582b35782118ade08498adc03f3fda01979ff8bed61e0520edae46d7bfe477")
 
     depends_on("cxx", type="build")  # generated
-
+    depends_on("c", type="build")
     depends_on("root")
     depends_on("root@:6.16.00", when="@b496504a")
     depends_on("eigen")

var/spack/repos/builtin/packages/py-pyqt5/package.py

@@ -19,6 +19,7 @@ class PyPyqt5(SIPPackage):
     version("5.15.9", sha256="dc41e8401a90dc3e2b692b411bd5492ab559ae27a27424eed4bd3915564ec4c0")
 
     depends_on("cxx", type="build")  # generated
+    depends_on("c", type="build")
 
     # pyproject.toml
     depends_on("py-sip@6.6.2:6", type="build")

var/spack/repos/builtin/packages/vbfnlo/package.py

@@ -44,6 +44,7 @@ class Vbfnlo(AutotoolsPackage):
 
     depends_on("cxx", type="build")  # generated
     depends_on("fortran", type="build")  # generated
+    depends_on("c", type="build")
 
     depends_on("hepmc")
     depends_on("gsl")