Removes -l from amcl.pc.in which results in a spurious flag generated in output .pc file.
Removes -l from amcl.pc.in which results in a spurious flag generated in output .pc file.

miracl/milagro-crypto-c,milagro-crypto/milagro-crypto-c,miracl/milagro-crypto-c,miracl/milagro-crypto-c,milagro-crypto/milagro-crypto-c,milagro-crypto/milagro-crypto-c,miracl/milagro-crypto-c,miracl/milagro-crypto-c,milagro-crypto/milagro-crypto-c