BUG: f2c is using the C99 keyword complex

[mattip]

complex is a macro in gcc's "complex.h", but it is also used in f2py-generated code to represent a complex float type. So if #include <complex.h> appears in the headers, there are many errors when compiling the linalg module due to code like this which uses complex as a type

numpy/numpy/linalg/lapack_lite/f2c_blas.c

Lines 32 to 36 in eef080a

	static complex c_b21 = {1.f,0.f};
	static doublecomplex c_b1078 = {1.,0.};
	/* Subroutine */ int caxpy_(integer *n, complex *ca, complex *cx, integer *
	incx, complex *cy, integer *incy)

[mattip]

cc @lysnikolaou

[WarrenWeckesser]

Fixed by #24364.