Detect intel fortran compiler

The intel fortran compiler "ifort" was not listed in the list of
default fortran compilers. This caused it to not be found unless
explicitly set via the FC.

authors.txt

@@ -82,3 +82,4 @@ Richard Hughes
 Rafael Fontenelle
 Michael Olbrich
 Ernestas Kulik
+Thomas Hindoe Paaboel Andersen

mesonbuild/environment.py

@@ -271,7 +271,7 @@ class Environment:
             self.default_cpp = ['c++']
         self.default_objc = ['cc']
         self.default_objcpp = ['c++']
-        self.default_fortran = ['gfortran', 'g95', 'f95', 'f90', 'f77']
+        self.default_fortran = ['gfortran', 'g95', 'f95', 'f90', 'f77', 'ifort']
         self.default_static_linker = ['ar']
         self.vs_static_linker = ['lib']
         self.gcc_static_linker = ['gcc-ar']