Optimized version of the glesv2.c

Size of the library is down from 31.8kB into 19.8kB

The functions themselves are far smaller.

Original version:
000056ec <glUniform1f>:
    56ec:       e59f3060        ldr     r3, [pc, #96]   ; 5754 <glUniform1f+0x68>
    56f0:       e92d4070        push    {r4, r5, r6, lr}
    56f4:       ee105a10        vmov    r5, s0
    56f8:       e08f3003        add     r3, pc, r3
    56fc:       e1a06000        mov     r6, r0
    5700:       e5933000        ldr     r3, [r3]
    5704:       e3530000        cmp     r3, #0
    5708:       0a00000f        beq     574c <glUniform1f+0x60>
    570c:       e59f4044        ldr     r4, [pc, #68]   ; 5758 <glUniform1f+0x6c>
    5710:       e08f4004        add     r4, pc, r4
    5714:       e59431c0        ldr     r3, [r4, #448]  ; 0x1c0
    5718:       e3530000        cmp     r3, #0
    571c:       0a000003        beq     5730 <glUniform1f+0x44>
    5720:       e1a00006        mov     r0, r6
    5724:       e1a01005        mov     r1, r5
    5728:       e12fff33        blx     r3
    572c:       e8bd8070        pop     {r4, r5, r6, pc}
    5730:       e59f1024        ldr     r1, [pc, #36]   ; 575c <glUniform1f+0x70>
    5734:       e5940000        ldr     r0, [r4]
    5738:       e08f1001        add     r1, pc, r1
    573c:       ebfff163        bl      1cd0 <_init+0x2c>
    5740:       e1a03000        mov     r3, r0
    5744:       e58401c0        str     r0, [r4, #448]  ; 0x1c0
    5748:       eafffff4        b       5720 <glUniform1f+0x34>
    574c:       ebfff19e        bl      1dcc <_init+0x128>
    5750:       eaffffed        b       570c <glUniform1f+0x20>
    5754:       00009fd0        ldrdeq  r9, [r0], -r0
    5758:       00009fb8                        ; <UNDEFINED> instruction: 0x00009fb8
    575c:       00001944        andeq   r1, r0, r4, asr #18


New version:

00003878 <glUniform1f>:
    3878:       e92d4008        push    {r3, lr}
    387c:       ee101a10        vmov    r1, s0
    3880:       e59f300c        ldr     r3, [pc, #12]   ; 3894 <glUniform1f+0x1c>
    3884:       e08f3003        add     r3, pc, r3
    3888:       e59331c0        ldr     r3, [r3, #448]  ; 0x1c0
    388c:       e12fff33        blx     r3
    3890:       e8bd8008        pop     {r3, pc}
    3894:       00008f40        andeq   r8, r0, r0, asr #30

In addition each function performs 2 loads less so it should be bit more cache friendly.

Based on tests in target device no measurable perfomance penalty was detected.